12 best hole enlarging drill bits

• Cobalt high speed steel along with the titanium coating ensures extreme durability, will stay new and shiny for years to come.
• Different sized shanks ensure compatibility with 1/4, 3/8 and 1/2 in. chuck sizes.
• Non-walking drill tip provides fast and smooth drills on steel sheets, aluminum sheets, wood board, plastic board etc. (the board must be smaller in thickness than the height of step drill bits).
• Please mark the spot that you are to drill for easier drilling and improved drill bits life.
• All the bits come in a well-organized case for easy transport and storage.

User questions & answers

Question:	How good is the quality
Answer:	This is a set of 5 drill bits. You can use either 3/8 or 1/2 drill with the drill bits included.
Question:	Is this for a 3/8 drill or
Answer:	You don't "need" any of these bits. Both, my...another family member and I purchased these as the touting of cobalt, titanium, and High Speed Steel bits made us both believe they were a steal of a steel deal. Boy we couldn't have been more wrong! Destroyed 1st use at slow speed off the speed chart and using tapping fluid to lubricate. These are absolute garbage. AGAIN THESE ARE ABSOLUTE GARBAGE BITS. I've got a free pocket knife from a gas station that drills better. Shavings from the first time we used these bits were put in the MassSpec at his showed NO cobalt at all present. For those that don't know a mass spectrometer gives you a breakdown of the molecules and elements present in a sample. Upon my complaining to the seller, I was told well.... "They're only cobalt colored and aren't intended for use on steel or hard metal alloys." You buy a cobalt %containing bits to handle the higher frictional heats encounters when cutting/drilling tougher steel alloys, stainless, or even just wanting your High Speed Steel bits to last longer. It's so your bit doesn't take damage and be destroyed or worse yet damage the piece you're drilling (especially when you're using tapping fluid too to lubricate the cutting edges reducing that friction and subsequent damaging heat) and M42 is the highest grade of cobalt bits I have & that I know of / have used. You buy titanium bits from M7 (high molybdenum for toughness) to M35 (HSS with a 5% titanium component) or the king of titanium bits and heat dissipation (HSS with 8% titanium) so your bits won't be damaged to the point they're unable to be used again. These high end bits you pay for ones made right. There are proper recipies the boundaries mix up molten of all the components from the iron and nickel of base steel, to adding molybdenum for toughness, cobalt for thermal resilience, titanium coatings to reduce friction, and many many more components in a bakery for steel. These bits are beyond poorly made and are NOT good moreless decent bits. So I'll reiterate fro my own and others experience, THESE ARE JUNK AND YOU DONT "NEED" THEM.....well unless you need to drill holes in pure Gallium at ambient temperatures above 30°C. And just a FYI I have 1/8" M42 aircraft legnth bits that'll drill through a 10" hardened steel block and a 1.0" M42 bit that could just about drill aluminum foil without tearing it. Size has nothing to do with quality. Small bits for small sheets and big bits for big sheets is a cop out answer to make the customer think they're the problem in how they're using the bits. The bits are crap and the Seller sends different answers to different people. They're garbage bits from cheap garbage metal (I hesitate to even call them true steel) see less
Question:	Are these bits titanium or cobalt? The product description shows both titanium & cobalt
Answer:	You don't "need" any of these bits. Both, my...another family member and I purchased these as the touting of cobalt, titanium, and High Speed Steel bits made us both believe they were a steal of a steel deal. Boy we couldn't have been more wrong! These are absolute garbage. AGAIN THESE ARE ABSOLUTE GARBAGE BITS. I've got a free pocket knife from a gas station that drills better. Shavings from the first time we used these bits were put in the MassSpec at his showed NO cobalt at all present. For those that don't know a mass spectrometer gives you a breakdown of the molecules and elements present in a sample. Upon my complaining to the seller, I was told well.... "They're only cobalt colored and aren't intended for use on steel or hard metal alloys." You buy a cobalt %containing bits to handle the higher frictional heats encounters when cutting/drilling tougher steel alloys, stainless, or even just wanting your High Speed Steel bits to last longer. It's so your bit doesn't take damage and be destroyed or worse yet damage the piece you're drilling (especially when you're using tapping fluid too to lubricate the cutting edges reducing that friction and subsequent damaging heat) and M42 is the highest grade of cobalt bits I have & that I know of / have used. You buy titanium bits from M7 (high molybdenum for toughness) to M35 (HSS with a 5% titanium component) or the king of titanium bits and heat dissipation (HSS with 8% titanium) so your bits won't be damaged to the point they're unable to be used again. These high end bits you pay for ones made right. There are proper recipies the boundaries mix up molten of all the components from the iron and nickel of base steel, to adding molybdenum for toughness, cobalt for thermal resilience, titanium coatings to reduce friction, and many many more components in a bakery for steel. These bits are beyond poorly made and are NOT good moreless decent bits. So I'll reiterate fro my own and others experience, THESE ARE JUNK AND YOU DONT "NEED" THEM.....well unless you need to drill holes in pure Gallium at ambient temperatures above 30°C. And just a FYI I have 1/8" M42 aircraft legnth bits that'll drill through a 10" hardened steel block and a 1.0" M42 bit that could just about drill aluminum foil without tearing it. Size has nothing to do with quality. Small bits for small sheets and big bits for big sheets is a cop out answer to make the customer think they're the problem in how they're using the bits. The bits are crap and the Seller sends different answers to different people. They're garbage bits from cheap garbage metal (I hesitate to even call them true steel)
Question:	Noob question, but why do I need five of these bits? It seems like you could get all the increments with one or two
Answer:	It will definitely cut aluminum...its I deal for porting a cylinder head...

Product features

Advantages of HSS Step Drill Bits

Product description

Step Drill Bit, Material Cobalt, Steam Oxide Finish, Number of Hole Sizes 8, Shank Size 7/16 In., Step Thickness 1/8 In., Size Range 9/16 In. to 1 In., Sizes Included 9/16 In., 5/8 In., 11/16 In., 3/4 In., 13/16 In., 7/8 In., 15/16 In., 1 In., Number of Flutes 1, Shank Type Hex, Bit Length 3 In.

From the Manufacturer

Irwin Unibit Cobalt is made of high speed steel, this step drill bit will last longer in the toughest of materials. Irwin Industrial Tools 10220CB 20 8 Hole Sizes (9/16-Inch-1-Inch), 1/16-Inch Increments - Hole Enlarging

• Made in: United States
• Power Cutting & Sawing
• Package Dimensions: 1.016 H x 15.24 L x 6.858 W (centimeters)
• Country of manufacture: United States

User questions & answers

Question:	Will this work in wood. Need to enlarge 7/8" hole to
Answer:	The IRWIN 10220CB will not give you the desired cut with one pass. Therefore we do not recommend it for 1/4" thick steel.
Question:	Will this work in 1/4" thick steel
Answer:	You don't "need" any of these bits. Both, my...another family member and I purchased these as the touting of cobalt, titanium, and High Speed Steel bits made us both believe they were a steal of a steel deal. Boy we couldn't have been more wrong! They were destroyed the first time used. Following the slow speed on the charts for the 2 steels and using tapping fluid to lubricate. These are absolute garbage. AGAIN THESE ARE ABSOLUTE GARBAGE BITS. I've got a free pocket knife from a gas station that drills better. Shavings from the first time we used these bits were put in the MassSpec at his showed NO cobalt at all present. For those that don't know a mass spectrometer gives you a breakdown of the molecules and elements present in a sample. Upon my complaining to the seller, I was told well.... "They're only cobalt colored and aren't intended for use on steel or hard metal alloys." You buy a cobalt %containing bits to handle the higher frictional heats encounters when cutting/drilling tougher steel alloys, stainless, or even just wanting your High Speed Steel bits to last longer. It's so your bit doesn't take damage and be destroyed or worse yet damage the piece you're drilling (especially when you're using tapping fluid too to lubricate the cutting edges reducing that friction and subsequent damaging heat) and M42 is the highest grade of cobalt bits I have & that I know of / have used. You buy titanium bits from M7 (high molybdenum for toughness) to M35 (HSS with a 5% titanium component) or the king of titanium bits and heat dissipation (HSS with 8% titanium) so your bits won't be damaged to the point they're unable to be used again. These high end bits you pay for ones made right. There are proper recipies the boundaries mix up molten of all the components from the iron and nickel of base steel, to adding molybdenum for toughness, cobalt for thermal resilience, titanium coatings to reduce friction, and many many more components in a bakery for steel. These bits are beyond poorly made and are NOT good moreless decent bits. So I'll reiterate fro my own and others experience, THESE ARE JUNK AND YOU DONT "NEED" THEM.....well unless you need to drill holes in pure Gallium at ambient temperatures above 30°C. And just a FYI I have 1/8" M42 aircraft legnth bits that'll drill through a 10" hardened steel block and a 1.0" M42 bit that could just about drill aluminum foil without tearing it. Size has nothing to do with quality. Small bits for small sheets and big bits for big sheets is a cop out answer to make the customer think they're the problem in how they're using the bits. The bits are crap and the Seller sends different answers to different people. They're garbage bits from cheap garbage metal (I hesitate to even call them true steel) see less

• Material:：High Speed Steel(HSS) with Titanium Coated
• Self starting：no need for a pilot hole.Cobalt coated to reduce friction and run at cooler temperature.
• Spiral Design：3 Flute spiral blade design makes the cutting faster and smoother, and automatically deburred from the hole when the drill bit is drilled
• Application：Suitable to cut holes in a variety of material like iron plate, aluminum plate, insulation boards, PVC sheet, ect
• Package includes：1 x 6-65mm HSS Groove Step Drill (13 Steps:6mm, 10mm, 15mm, 20mm, 25mm, 30mm, 35mm, 40mm, 45mm, 50mm, 55mm, 60mm, 65mm)

User questions & answers

Question:	Hi, for the ocgig model 6-60mm, what is the angle
Answer:	6-60mm bit is make of HHS4341 for Cutting holes in materials, like iron plate, aluminum plate, insulation boards, PVC sheet, ect.(Hardness
Question:	Can this cut through steel door for deadbolt installation
Answer:	Hello!This OCGIG 6-60mm(0.236-2.36") Large HSS Spiral Groove Step Drill includes 12 steps. The 12 Steps:0.236inch,0.393inch,0.59inch,0.787inch,0.984inch,1.18inch,1.377inch,1.574inch,1.771inch,1.968inch,2.165inch,2.362inch.
Question:	Is there an inch version
Answer:	Hello!This 6-65mm HSS Spiral Groove Step Drill is 1/4" Hex shaft drives and 13 Steps(6mm, 10mm, 15mm, 20mm, 25mm, 30mm, 35mm, 40mm, 45mm, 50mm, 55mm, 60mm, 65mm). We also sell 6-60mm Large HSS Spiral Groove Step Drill (https://www.amazon.com/dp/B07B7G4RY8). If you have any questions, please feel free to contact us.
Question:	Do you sell more than one version of this? I just received my bit, but it only has 2-flutes and has a ½” shank, so the description isn’t very good
Answer:	Yes, is the sizing starts at or below 7/8 and goes up to 1 or larger it will work perfectly.

Product features

OCGIG 6-65mm Large HSS Spiral Groove Step Drill Titanium Coated Bit Hole Cutter

Product Parameters

Total Length:12.5cm/4.92inch

Diameter of the shank:1cm/0.39inch

Drill Blade Length:9mm/0.354inch

Bevel Height:3.6mm/0.142inch

Blade Length Per section:5mm/0.197mm

6-65mm: 13 Steps (6,10,15,20,25,30,35,40,45,50,55,60,65mm)

Widely Used & Attention

1.The rapid strike tip drills twice as fast as the average step drills and can drill acrylic, PVC, wood, aluminum and iron sheets up to 0.2'' in thickness.

2.Note:High temperature will occur during work, and it is necessary to add parallel coolant to cool the drill bit.

Longer Service Life

Titanium alloy coating reduces friction and they are more durable than uncoated drill bits. HSS(High speed steel).

Four Attractive Advantages

The step drill bits is High Hardness,High Quality,High Efficiency and High Reward.And it is made of high speed steel and titanium coating and has strong durability.

Attractive&Practical Design

1.Tapered design is suitable for drilling larger and deeper holes, or enlarging the aperture in areas where it has been drilled.

2.Cutting blade design makes for cutting faster,automatic deburring from hole when drilling.

6-65mm Step Structure

This OCGIG drill bit can drill a wide range of apertures.And it can complete deburring, chamfering and rounding.

Product description

The IRWIN Unibit #21M High-Speed Steel Metric Hole-Enlarging Step Drill Bit is ideal for drilling holes into thin materials, such as stainless-steel, copper, brass, aluminum, plastic and laminates. Each drill bit uses a single-flute cutting edge that gives a true, round hole and provides greater control through steps. The hex shank helps prevent slipping in the drill chuck. The #21M drill bit creates 20mm to 34mm holes with 8 steps.

From the Manufacturer

UNIBIT 21M 8 Hole Sizes (20 mm - 34 mm), 2 mm Increments - Hole Enlarging

• These IRWIN Unibit step drill bits have a hex shank to help prevent slipping in the drill chuck
• This Unibit step drill bit uses a single-flute cutting edge for greater control and true, round holes
• IRWIN Unibit #21M step drill bit creates holes from 20mm to 34mm with 8 steps
• Ideal for drilling holes into thin materials, such as stainless-steel, copper, brass, aluminum, plastic and laminates
• Maximum material thickness of 5mm
• These IRWIN Unibit step drill bits have a hex shank to help prevent slipping in the drill chuck
• This Unibit step drill bit uses a single-flute cutting edge for greater control and true, round holes

Product description

Product Name:

FACHLICH F965K1 8 pieces/box Diamond Hole Saw Core Drill Bits Kit



Specification:

Core bits: Diameter 19/28/35/45/51mm, 5/8-11 thread, Total Length 75MM, Diamond height 15mm

Milling bits: Diameter 20mm, 5/8-11 thread, Total Length: 65mm, 50MM workable length,Grit #50/60



Quantity:

8 pieces(including 5 pieces core bits, 1 piece milling bit, 2 pieces different adapter for using) and a big box for storaging



Application:

For drilling porcelain tile granite marble stone masonry brick.....



Feature:

Dry or wet drilling

Less Chipping, Minimizing breakage, less heat generation, Better finish quality

High diamond exposure rate provides a faster and more aggressive drilling

Vacuum Brazed technology provides longer working life, Fast and smooth drilling

Vacuum Brazed technology provide much longer working life than electroplated ones (Generally 3-5times),Save your money and time....

• Core Bits Kit(F965K1) Contains: 6 pieces(19/28/35/45/51mm) drill bits, 1 piece 20mm milling bit, 2 pieces adapters(hex shank&M14); total 8 pieces/box
• The thread of all bits are 5/8"-11, the hex shank&M14 adapters could change the arbor from 5/8"-11 to Hex shank and M14.
• All bits are produced in Vacuum Brazed technology, which could provide longer working life, Fast and smooth drilling
• Core bits are designed for drill Porcelain Tile Granite Marble Masonry Brick and all similar materials
• Diamond milling bit is used for Enlarging, shaping and/or rounding bevel existing holes in Porcelain, Hard Ceramic, marble and granite

Product description

Raizi Universal Diamond Finger Drilling Milling Bit For Enlarging and Shaping Holes on Porcelain Ceramic tiles, Granite, Marble, Quartz and Engineered stone

Attention:

It isn’t designed to make holes,it was designed to shape and enlarge existing holes.

Specification:

1)Use: Dry and wet use.

2)Package:1 bit with carton.

3)Thread:5/8"-11 Thread

4)Size:25mm

Advantage:

1)It is a versatile milling bit designed to enlarge, shape and/or round bevel existing holes in Porcelain, Hard Ceramic, Granite and Marble.and it's also suitable to easily create round side indentation necessary to accomodate pipes or electric wire lines.

2)This is a save money tool because with just one standard core bit and this finger bit you are able to create many different hole sizes, without needing to buy several different core bits.

3)It is manufactured with top quality raw materials and high end production processes to grant outstanding performances.

4)It can be used with any 5/8"-11 Thread standard grinder.

5)No adaptors needed.

6)Recommended for Tile Setters, General Contractors, Plumbers and Electricians.

Note:In the process of transportation, some paint may drop off, but it will not affect the use.

• It is a versatile milling bit designed to enlarge, shape and/or round bevel existing holes in Porcelain, Hard Ceramic, Granite and Marble.and it's also suitable to easily create round side indentation necessary to accomodate pipes or electric wire lines.
• It can be used with any 5/8"-11 Thread standard grinder.
• This is a save money tool because with just one standard core bit and this finger bit you are able to create many different hole sizes, without needing to buy several different core bits.
• It is manufactured with top quality raw materials and high end production processes to grant outstanding performances.
• Recommended for Tile Setters, General Contractors, Plumbers and Electricians.

• Products Included: 6-Piece Core Drill bits(25/35/45/51/65/76mm)+25mm Finger Bits,total 7 pieces/Box
• Core Drill Bits are designed for Dry/wet drilling porcelain tile, granite, marble, brick and all similar material
• Finger Bits are provided for enlarging, shaping or rounding bevel existing holes in Porcelain,Marble,Granite and Hard Ceramic...
• Vacuum Brazed technology provide much longer working life,fast and smooth drilling
• It usually takes 5-7 business days for us to deliver them to you from China

User questions & answers

Question:	I need to cut a 2.5" hole through my exterior brick wall. will this bit cut deep enough
Answer:	Hello! This Bevel angle of OCGIG 6-60mm Large Step Drill at the back of the product is 45 degrees.

Product features

SHDIATOOL Diamond Core Drill Bits Kit No.3

• Products Included:
• 1-Piece: 25mm Finger Bit
• 6-Piece Core Drill bits: 1"(25mm), 1-3/8"(35mm), 1-3/4"(45mm), 2"(51mm), 2-1/2"(65mm), 3"(76mm)
• Total 7 Pieces/Box for Drilling Porcelain Tile Granite Marble Brick Stones...

• Why SHDIATOOL:
• SHDIATOOL is a professional manufacturer and supplier of diamond tools.We are focus on providing high-quality and practical products for professionals.Our tools cover diamond saw blade,grinding wheel,diamond bits,polishing pads..., mainly for processing granite marble concrete ceramic porcelain block stone iron steel and so on.

Details of Products

• Core Drill Bits:
• Diameter 19-152mm：50mm Max working depth, 15mm Diamond height, Total Length 75mm
• Diamond Finger Bit: 25MM Diameter, 50MM workable length, Length: 65mm

Connection

• With The Thread of all bits are 5/8-Inch-11, Recommended Machine: angle grinder

High quality Diamond Grain

• Diamond Hole Bits are made with High-strength steel and High quality Diamond Grain
• Which could not only provide fast and smooth drilling, but also ensure longer workable life

Vacuum Brazed technology

• Vacuum Brazed tech. makes the industrial diamond grains permanently brazed to the edge of steel core,creating an unbreakable and extremely heat resistant segments
• So you could drill holes in Dry/Wet Conditon, very convenient

5/8"-11

• With the Thread of 5/8-Inch-11, Used on angle grinder,very easy to operate

Step 1

• Fix it on angle grinder tightly and rightly
• Turn on the angle grinder and let the bit rotating in the air to check if there is balance problem

Step 2

• Place the drill at a 20-45 degree angle
• Drilling till the hole start to form

Step 3

• Bring the drill up into upright position
• Continue to drill and swaying the machine along a circle

Wide Application

• Vacuum Brazed Diamond Hole Saws are dersigned for drilling Porcelain, Tile, Granite, Marble, Stone, Masonry, Brick and all similar materials
• Ideal for drilling the faucet mounting holes in stone countertops, plumbing lines in showers and vanities
• Dry or Wet Drilling - use wet will greatly prolong the segment life
• Please wear all applicable safety gear when using these Diamond Bits (eyes/ears/face/hands/body/etc).

• Hss & Titanium Coating ----- High-speed steel makes it last longer than others, titanium coating ensure easily cut through iron sheets, aluminum sheets, copper & plastic & wood board and many other types of sheet metal with ease, and it can automatically deburr holes while drilling to keep the drill bit clean.
• Titanium Coating ----- Coated with titanium, this step drill set performs well in heat, corrosion and rust resistance.
• Revolutionary Design ----- Tri-flatted shank fits into power tools chuck securely and eliminates slip; two-flute design clears chips faster and allows particles to escape easily.
• Includes 10 STEP SIZES ----- 1/4", 3/8", 1/2", 5/8", 3/4", 7/8", 1", 1-1/8", 1-1/4", 1-3/8".
• A Must-Have for Handyman or Professionals ----- Perfect for home repairs and light jobs such as drilling holes in plastic, aluminum, copper, iron and many other types of sheet metal (excluding steel or any other harder metal).

Product features

Convenient & Accurate

• Laser-engraved reference marks on each bit offer superb convenience and accuracy, ideal for drilling large and small-diameter holes in metal and plastic. For high-efficient drilling, thickness of sheet metal shall be less than that of each step

Compatible with Electric Drill

• Compatible with 1/4, 3/8, 1/2 electric drills or bench drills, but only work for sheet metal, aluminum or plastic.

Sleek & Accurate Drilling

• X-type openings design to facilitate the removal of cutting waste when drilling, preventing iron chips or sawdust from scattering and ensuring sleek & accurate drilling.

• HSS Titanium Coating - High speed steel along with titanium coating ensures outstanding durability and sharpness, can reduces the friction, runs cooler.
• Meet Your Demands - With the step drill bits we offered, you can process different kinds of diameter holes, which greatly saves you a lot of trouble.Great for metal/wood/plastic countersunk. Suitable for Home DIY, and General Building/Engineering Use.
• Design - The split point tip is at 118 degrees to increase the wear resistance. The two flute design provides a smoother cutting, allows the material particles escape easily for a much more clean drilling operation.
• Easy Organizing - A drill bits holder with size index is included in the metal kit for easy storage and organizing without fear of it falling out.
• Set Includes - The drill bits set includes five common sizes for versatility, can fit the majority of brands currently on the market.

User questions & answers

Question:	Can the comoware step drill boit be used to drill in 1/4" thick steel
Answer:	What I would do is find a small scrap piece of PVC pipe. To test the step bit out on
Question:	Can this be used on 3/4 inch pvc
Answer:	Please note shipping with USPS is in a chaotic state of operations. No fault on Amazon's behalf. I would asked the seller when applicable to ship either FedEx or UPS. That's what I did after suffering the continuous delays of USPS.
Question:	I ordered this kit, on the 14th of April why is it taking so long to get delivered
Answer:	Drill holes into metal panels, lumber, etc. Mainly used for expanding previous drill holes. It can use to drill new holes for materials under 1/4" thick
Question:	What are these tools used for?What are these tools used for
Answer:	It depends on the thickness of your brick wall, the Max working depth of diamond hole saw kit is 50mm. As for drilling bricks, this kind of diamond hole saw has a good performance on drilling tile porcelian brick marble and all similar materials in dry or wet condition. We deeply recommend this core drill bits kit if the thickness of your exterior brick wall is less than 50mm.

Product features

COMOWARE TOOL

6 Pcs Step Drill Bit Set with Center Punch

The professional manufacturer of titanium cobalt drill bits, countersink drill bits, spade drill bits and kinds of cutting tools.

Whether your requirements are for one drill bit or one million we will be happy to fulfill your needs with excellent service and high-quality products.

Size:

#1: 1/4" to 1-3/8" 10 Steps (1/4'', 3/8", 1/2", 5/8", 3/4", 7/8", 1", 1-1/8", 1-1/4", 1-3/8")

#2: 3/16" to 7/8" 12 Steps (3/16'', 1/4", 5/16", 3/8", 7/16", 1/2", 9/16", 5/8", 11/16", 3/4", 13/16",7/8")

#3: 1/4" to 3/4'' 9 Steps (1/4'', 5/16", 3/8", 7/16", 1/2", 9/16", 5/8", 11/16", 3/4")

#4: 1/8" to 1/2" 13 Steps (1/8", 5/32", 3/16'', 7/32", 1/4'', 9/32", 5/16", 11/32", 3/8'', 13/32", 7/16'', 15/32", 1/2'')

#5: 3/16" to 1/2" 6 Steps (3/16'', 1/4'', 5/16", 3/8'', 7/16'', 1/2'')

• 【HSS Titanium Coating】High speed steel along with titanium coating ensures outstanding durability and sharpness, self starting- No need for a pilot hole,Made of super strong HSS steel for added durability and bit life
• 【50 Size in 5 Bits】Set includes five standard SAE step drill bits with a two-flute design for faster, that can replace 50 individual drill bits, you can process 50 different kinds of diameter holes with the five pieces
• 【Easy to use】Double cutting blades and X-type openings design ensure a faster, smoother cutting and a tri-flat shank for a sure grip
• 【Carrying case】Set includes a sturdy aluminum organizing case for secure storage and easy carrying
• 【After-Sales Service】Please read the description and the specifications before you purchase. We offer 12 months money back guarantee

Product features

Package Included:

5 standard step drill bits

Specification：

Sizes:

-#1: 3/16" to 1/2" 6 Steps (3/16'', 1/4'', 5/16", 3/8'', 7/16'', 1/2'')

-#2: 1/8" to 1/2" 13 Steps (1/8", 5/32", 3/16'', 7/32", 1/4'', 9/32", 5/16", 11/32", 3/8'', 13/32", 7/16'', 15/32" , 1/2'')

-#3: 1/4" to 3/4'' 9 Steps (1/4'', 5/16", 3/8", 7/16", 1/2", 9/16", 5/8", 11/16", 3/4")

-#4: 1/4" to 1-3/8"' 10 Steps (1/4'', 3/8", 1/2", 5/8", 3/4", 7/8", 1", 1-1/8", 1-1/4", 1-3/8")

-#5: 3/16" to 7/8" 12 Steps (1/4'', 5/16", 3/8", 7/16", 1/2", 9/16", 5/8", 11/16", 3/4", 13/16", 7/8")

PVC

copper

aluminum alloy

cast iron

• The step drill bit is made from upgraded high speed steel characterized by well-balanced toughness, wear resistance and red hardness properties for better and faster hole -drilling performance. The titanium coating makes the drill bit more durable so that it can last for years with uncompromised quality.
• The dual-flute design prevents metal fillings from flying around and clears chips faster thus it can drill more smoothly without heating up.
• The rapid strike tip drills twice as fast as the average step drills and can drill acrylic, PVC, wood, aluminum and iron sheets up to 0.2’’ in thickness.
• Our drill bit is bigger in size so it can drill holes with larger dimensions.
• 12 hole sizes: 1/4; 3/8; 19/32; 3/4; 1'; 1'3/16; 1'3/8; 1'5/8; 1'3/4; 2'; 2'3/16; 2'3/8.

User questions & answers

Question:	does this tool come in larger sizes
Answer:	In this case you are right. Mine also is 1/2 inch shaft But what they meant in the description 1/4 - 2 3/8 was the size variation of the holes the bit drilled.. The reason I bought this was because it did a 2 inch hole and I could not find one in town that did.. I bought it because it had a 1/2 shaft for my drill press.. I think what you did (as I have done many times myself) is read it to fast and though it said 1/4 - 3/8 when it said 1/4 - 2 3/8.. Send it back I am sure they will take it back. Or you could do what I do sometimes and that is smack myself in the head for being in to much of a hurry and sell it on craigs list... Hope this helped.
Question:	I'm not sure how this is claimed to work with 1/4 and 3/8 drills? I have both and it does not fit either of them, this step bit requires a
Answer:	Yes, it is the actual weight of the bit.
Question:	Is 1.68 pounds the actual weight of the bit
Answer:	Unfortunately no, the shank is larger than the typical 1/4" hex shank on impact bits.
Question:	does this fit an impact driver
Answer:	Absolutely, it can. However, if I were you I would attempt that job with a high tempered heat treated drill bit and a dab of cutting oil to preserve the bit. Good drilling to you and be safe please.

Product features

Convenient & Accurate

• Laser-engraved reference marks on each bit offer superb convenience and accuracy, ideal for drilling large and small-diameter holes in metal and plastic. For high-efficient drilling, thickness of sheet metal shall be less than that of each step.

Universal Compatibility

• Compatible with 1/4, 3/8, 1/2 electric drills or bench drills, but only work for sheet metal, aluminum or plastic.

Sleek & Accurate Drilling

• X-type openings design to facilitate the removal of cutting waste when drilling, preventing iron chips or sawdust from scattering and ensuring sleek & accurate drilling.

User questions & answers

Question:	What are the shank sizes i see 2 different sizes i do not have a 1/2 " drill just
Answer:	I guess around 2” or so long
Question:	what are the dimensions of the bits? length-wise
Answer:	I don't know the answer to that but I would try it. Go slow and use drilling oil.
Question:	Can it drill thru 3/16 thick cast alimum
Answer:	It should. I'm a mechanic and I've used these to drill out broken exhaust hardware and lug nuts. Key to making it easy and make them last long is not to drill too fast and use a lubricant such as a penetrating lubricant.
Question:	Will this drill thru a typical metal bed frame
Answer:	We're afraid that we don't have the larger size ones. Thank you.

Product features

Features of CO-Z Titanium Step Bits

Convenient & Accurate

• Laser-engraved reference marks on each bit offer superb convenience and accuracy, ideal for drilling large and small-diameter holes in metal and plastic. For high-efficient drilling, thickness of sheet metal shall be less than that of each step.

Universal Compatibility

• Compatible with 1/4, 3/8, 1/2 electric drills or bench drills, but only work for sheet metal, aluminum or plastic.

Sleek & Accurate Drilling

• X-type openings design to facilitate the removal of cutting waste when drilling, preventing iron chips or sawdust from scattering and ensuring sleek & accurate drilling.