Updated:June, 2026

10 Best Cobalt Drill Bits For Hardened Steel of 2026

Save up to5% Off

Best Choice

9.9

Outstanding

Sinyeenglon

Sinyeenglon Cobalt Drill Bits Set for Hardened Metal and Stainless Steel, 99Pcs M35 High Speed Steel Twist Jobber Drill Bits 1/16"-3/8", with Plastic Index Storage Case

Why We Love It

Cobalt M35 Material: High cost, but hardness is up to 67, cut faster and has a long life, up to 12 times compared with the average HSS titanium coated bit, save time and improve efficiency
Hardened Full Grinding Process: Increases wear resistance, sharp and durable, used for stainless steel, cast iron, zinc alloy, titanium, aluminum, hard metal, plastic and wood
Packaging: Hard and thick plastic box, drills bagged for compartmentalized storage, reasonable design, well secured package
Convenient Access: Various sizes are placed in different compartments of the plastic box, and the corresponding sizes of different drills are printed on the bottom of the lid, making it very convenient to access
Various Sizes: 16Pcs 1/16in, 16Pcs 5/64in, 15Pcs 3/32in, 10Pcs 7/64in, 10Pcs 1/8in, 8Pcs 9/64in, 8Pcs 5/32in, 3Pcs 11/64in, 3Pcs 3/16in, 2Pcs 13/64in, 2Pcs 7/32in, 2Pcs 1/4 in, 2Pcs 5/16in, and 2Pcs 3/8in
Widely used: Whether you're a home DIYer or workshoper of professional drilling, it's a great tool
Use Notices: Drill bit should be vertical to the workpiece when used; controling low speed from 200 to 1000 rpm; using cutting fluid will stay cool to make the bit last longer

Check Price

Why We Love It

Cobalt M35 Material: High cost, but hardness is up to 67, cut faster and has a long life, up to 12 times compared with the average HSS titanium coated bit, save time and improve efficiency
Hardened Full Grinding Process: Increases wear resistance, sharp and durable, used for stainless steel, cast iron, zinc alloy, titanium, aluminum, hard metal, plastic and wood
Packaging: Hard and thick plastic box, drills bagged for compartmentalized storage, reasonable design, well secured package
Convenient Access: Various sizes are placed in different compartments of the plastic box, and the corresponding sizes of different drills are printed on the bottom of the lid, making it very convenient to access
Various Sizes: 16Pcs 1/16in, 16Pcs 5/64in, 15Pcs 3/32in, 10Pcs 7/64in, 10Pcs 1/8in, 8Pcs 9/64in, 8Pcs 5/32in, 3Pcs 11/64in, 3Pcs 3/16in, 2Pcs 13/64in, 2Pcs 7/32in, 2Pcs 1/4 in, 2Pcs 5/16in, and 2Pcs 3/8in
Widely used: Whether you're a home DIYer or workshoper of professional drilling, it's a great tool
Use Notices: Drill bit should be vertical to the workpiece when used; controling low speed from 200 to 1000 rpm; using cutting fluid will stay cool to make the bit last longer

How We Find the Top Picks

We use smart data tools to review thousands of products and stores, analyzing ratings, reviews, and popularity trends to highlight what truly matters to shoppers like you.

Our experts then refine the results, blending AI insights with real user experiences to deliver accurate, up-to-date rankings that help you choose with confidence.

9.5

Excellent

Bosch

BOSCH CO14B 14-Piece Assorted Set with Included Case - Cobalt M42 Metal Drill Bits with Three-Flat Shank for Drilling Applications in Stainless Steel, Cast Iron, Titanium, and Light-Gauge Metal

Main Highlights

Cobalt M42 drill bit provides upgraded M42 Cobalt jobber-length bits designed for durability, high heat resistance and Hardened surface for stainless steel, cast iron, titanium, light-gauge metal and aluminum
Enhanced M42 alloy material contains 8% Cobalt alloy that delivers 10x life vs. Standard bits
High-heat resistant bits withstand high-temperature applications for extended periods of time
Thick web-helix design provides additional stability in tough applications
Surface-hardened tip penetrates tough abrasive materials
Includes 1/16", 5/64", 3/32", 7/64", 1/8", 9/64", 5/32", 3/16", 7/32", 1/4", 5/16", 3/8", 1/2"

Check Price

Main Highlights

Cobalt M42 drill bit provides upgraded M42 Cobalt jobber-length bits designed for durability, high heat resistance and Hardened surface for stainless steel, cast iron, titanium, light-gauge metal and aluminum
Enhanced M42 alloy material contains 8% Cobalt alloy that delivers 10x life vs. Standard bits
High-heat resistant bits withstand high-temperature applications for extended periods of time
Thick web-helix design provides additional stability in tough applications
Surface-hardened tip penetrates tough abrasive materials
Includes 1/16", 5/64", 3/32", 7/64", 1/8", 9/64", 5/32", 3/16", 7/32", 1/4", 5/16", 3/8", 1/2"

9.5

Excellent

SEDIANAS

Cobalt Drill Bit Set - 15Pcs M35 HSS Twist Drill Bits, Straight Shank, Metal Drills bit Set for Hardened Metal, Stainless Steel, Cast Iron, Wood and Plastic with Index Storage Case, 1/16"-3/8"

Main Highlights

M35 Cobalt Drill Bit: Premium High Speed Steel M35 (Cobalt 5%) offers superior heat resistance and greater hardness compared to ordinary drill bits. It can extend the tool's service life when drilling hard materials.
135° Split Point Design: The cobalt drill bit set can be used effectively on most soft and hard objects, with a 135 degree point tip with round straight shank, self-centering to prevent walk-off, make drilling precise and faster.
Efficient Drilling: Fully Ground twist design helps clear particles faster, decreases friction and heat for a cooler drilling performance.
Various Sizes: 15 sets of drill bits include 1/16"x2pcs, 5/64"x2pcs, 3/32"x2pcs, 7/64", 1/8", 9/64", 5/32", 11/64", 3/16", 1/4", 5/16", 3/8", can meet more needs.
Widely Used: M35 Cobalt High Speed Steel is more suitable for tough, high tensile strength material. Particularly successful in cutting harden metals such as stainless steel, cast iron, high temperature alloy, titanium alloy, hard plastics and woods.
Organized Holder :The set includes 15Pcs (1/16"- 3/8") Cobalt Drill Bits, This cobalt drill bit also includes the drill bit holder with size index for easy storage and organizing.

Check Price

Main Highlights

M35 Cobalt Drill Bit: Premium High Speed Steel M35 (Cobalt 5%) offers superior heat resistance and greater hardness compared to ordinary drill bits. It can extend the tool's service life when drilling hard materials.
135° Split Point Design: The cobalt drill bit set can be used effectively on most soft and hard objects, with a 135 degree point tip with round straight shank, self-centering to prevent walk-off, make drilling precise and faster.
Efficient Drilling: Fully Ground twist design helps clear particles faster, decreases friction and heat for a cooler drilling performance.
Various Sizes: 15 sets of drill bits include 1/16"x2pcs, 5/64"x2pcs, 3/32"x2pcs, 7/64", 1/8", 9/64", 5/32", 11/64", 3/16", 1/4", 5/16", 3/8", can meet more needs.
Widely Used: M35 Cobalt High Speed Steel is more suitable for tough, high tensile strength material. Particularly successful in cutting harden metals such as stainless steel, cast iron, high temperature alloy, titanium alloy, hard plastics and woods.
Organized Holder :The set includes 15Pcs (1/16"- 3/8") Cobalt Drill Bits, This cobalt drill bit also includes the drill bit holder with size index for easy storage and organizing.

9.2

Excellent

SEDIANAS

Cobalt Drill Bit Set - 29Pcs M35 High Speed Steel Twist Drill Bits for Hardened Metals, Stainless Steel, Cast Iron and Wooden Plastics with Metal Index Storage Box, 1/16"-1/2"

Main Highlights

M35 Cobalt Drill Bit: Premium High Speed Steel M35 (Cobalt 5%) offers superior heat resistance and greater hardness compared to ordinary drill bits. It can extend the tool's service life when drilling hard materials.
135° Split Point Design: The cobalt drill bit set can be used effectively on most soft and hard objects, with a 135 degree point tip with round straight shank, self-centering to prevent walk-off , make drilling precise and faster.
Efficient Drilling: Fully Ground twist design helps clear particles faster, decreases friction and heat for a cooler drilling performance.
Various Sizes: 29 sets of drill bits include "1/16"5/64"3/32"7/64"1/8"9/64"5/32"11/64"3/16"13/64"7/32"15/64"1/4"17/64"9/32"19/64"5/16"21/64"11/32"23/64"3/8"25/64"13/32"27/64"7/16"29/64"15/32"31/64"1/2", can meet more needs.
Widely Used: M35 Cobalt High Speed Steel is more suitable for tough, high tensile strength material. Particularly successful in cutting harden metals such as stainless steel, cast iron, high temperature alloy, titanium alloy, hard plastics and woods.
Set Includes: The set includes 29Pcs (1/16"-1/2") Cobalt Drill Bits, This cobalt drill bit also includes the drill bit holder with size index for easy storage and organizing.

Check Price

Main Highlights

M35 Cobalt Drill Bit: Premium High Speed Steel M35 (Cobalt 5%) offers superior heat resistance and greater hardness compared to ordinary drill bits. It can extend the tool's service life when drilling hard materials.
135° Split Point Design: The cobalt drill bit set can be used effectively on most soft and hard objects, with a 135 degree point tip with round straight shank, self-centering to prevent walk-off , make drilling precise and faster.
Efficient Drilling: Fully Ground twist design helps clear particles faster, decreases friction and heat for a cooler drilling performance.
Various Sizes: 29 sets of drill bits include "1/16"5/64"3/32"7/64"1/8"9/64"5/32"11/64"3/16"13/64"7/32"15/64"1/4"17/64"9/32"19/64"5/16"21/64"11/32"23/64"3/8"25/64"13/32"27/64"7/16"29/64"15/32"31/64"1/2", can meet more needs.
Widely Used: M35 Cobalt High Speed Steel is more suitable for tough, high tensile strength material. Particularly successful in cutting harden metals such as stainless steel, cast iron, high temperature alloy, titanium alloy, hard plastics and woods.
Set Includes: The set includes 29Pcs (1/16"-1/2") Cobalt Drill Bits, This cobalt drill bit also includes the drill bit holder with size index for easy storage and organizing.

9.0

Excellent

WildBossy

M35 Cobalt Drill Bit Set 20PCS(1/16"-1/2") High Speed Steel Jobber Length Drill Bit Kit for Hardened Metal with Index Storage Case

Main Highlights

5% COBALT TWIST DRILL BITS SETMade from M35 Cobalt Steel with Molybdenum and Cobalt added to form a hardened alloy, can measure up to 67 Rockwell hardness, cut faster, last longer, and last longer than normal HSS drill bits 12 times.
SIZE1/16x2, 5/64x2, 3/32x2, 7/64x2, 1/8x2, 9/64, 5/32, 11/64, 3/16x2, 7/32, 1/4, 5/16, 3/8, 1/2 inch bits; Comes in plastic storage case for easy storage
TWIST DESIGN AND PERFORMANCEPrecise 135° SPLIT Point, Ti Surface and 3-Flat Shank. Prevents walking and removes chips and particles faster. Precision fully ground to ensure smooth chip movement.
PROFESSIONAL AND WIDELY USEDM35 Cobalt High Speed Steel is more suitable for hardening materials. Ideal for cutting stainless steel, steel and cast iron as well as wood, aluminum alloys and other metals. Not suitable for glass or ceramic materials. Pay attention to speed, pressure and heat control when drilling.
SERVICEIf you have any problem with our metric drill bit set or are not satisfied with the product, please feel free to contact WildBossy.

Check Price

Main Highlights

5% COBALT TWIST DRILL BITS SETMade from M35 Cobalt Steel with Molybdenum and Cobalt added to form a hardened alloy, can measure up to 67 Rockwell hardness, cut faster, last longer, and last longer than normal HSS drill bits 12 times.
SIZE1/16x2, 5/64x2, 3/32x2, 7/64x2, 1/8x2, 9/64, 5/32, 11/64, 3/16x2, 7/32, 1/4, 5/16, 3/8, 1/2 inch bits; Comes in plastic storage case for easy storage
TWIST DESIGN AND PERFORMANCEPrecise 135° SPLIT Point, Ti Surface and 3-Flat Shank. Prevents walking and removes chips and particles faster. Precision fully ground to ensure smooth chip movement.
PROFESSIONAL AND WIDELY USEDM35 Cobalt High Speed Steel is more suitable for hardening materials. Ideal for cutting stainless steel, steel and cast iron as well as wood, aluminum alloys and other metals. Not suitable for glass or ceramic materials. Pay attention to speed, pressure and heat control when drilling.
SERVICEIf you have any problem with our metric drill bit set or are not satisfied with the product, please feel free to contact WildBossy.

8.8

Very Good

MACXCOIP

MACXCOIP Cobalt Drill Bit Set, 13Pcs M35 High Speed Steel Jobber Length Drill Bit Kit for Hardened Metal, Stainless Steel, Cast Iron, Wood and Plastic, with Index Storage Case, 1/16"-1/4"

Main Highlights

Various Sizes: 13 sets of drill bits include 1/16", 5/64", 3/32", 7/64", 1/8", 9/64", 5/32", 11/64", 3/16", 13/64", 7/32", 15/64", 1/4", can meet more needs
M35 Cobalt Drill Bit: The M35 cobalt drill bit is a durable, sharp and robust drill bit suitable for cutting stainless steel, iron castings, copper, aluminum and other soft metals as well as plastics, wood etc
Quick and Efficient: The cobalt drill bit set can be used effectively on most soft and hard objects, with a 135 degree point tip and twist design for faster cutting, self-centering to prevent walk-off and faster chip and particle removal
HSS Drill Bit Set: HSS cobalt drill bit set for hardened steel with excellent cutting performance. 13 sets of drill bits for long term use. The inserts are hardened and polished for improved sharpness and precise cutting without wobbling
Easy Storage: The drill set includes a drill case with size indexes and is packaged in a small package for easy storage and sorting. If you have any questions, please refer to us and we will be happy to help you

Check Price

Main Highlights

Various Sizes: 13 sets of drill bits include 1/16", 5/64", 3/32", 7/64", 1/8", 9/64", 5/32", 11/64", 3/16", 13/64", 7/32", 15/64", 1/4", can meet more needs
M35 Cobalt Drill Bit: The M35 cobalt drill bit is a durable, sharp and robust drill bit suitable for cutting stainless steel, iron castings, copper, aluminum and other soft metals as well as plastics, wood etc
Quick and Efficient: The cobalt drill bit set can be used effectively on most soft and hard objects, with a 135 degree point tip and twist design for faster cutting, self-centering to prevent walk-off and faster chip and particle removal
HSS Drill Bit Set: HSS cobalt drill bit set for hardened steel with excellent cutting performance. 13 sets of drill bits for long term use. The inserts are hardened and polished for improved sharpness and precise cutting without wobbling
Easy Storage: The drill set includes a drill case with size indexes and is packaged in a small package for easy storage and sorting. If you have any questions, please refer to us and we will be happy to help you

8.6

Very Good

MACXCOIP

MACXCOIP Cobalt Drill Bit Set, 29Pcs M35 High Speed Steel Bits for Hardened Metals, Stainless Steel, Cast Iron and Wooden Plastics, with Metal Index Storage Box, 1/16"-1/2"

Main Highlights

Various Sizes: 29 sets of drill bits include 1/16", 5/64", 3/32", 7/64", 1/8", 9/64", 5/32", 11/64", 3/16", 13/64", 7/32", 15/64", 1/4", 17/64", 9/32", 19/64", 5/16", 21/64", 11/32", 23/64, 3/8", 25/64", 13/32", 27/64", 7/16, 29/64, 15/32", 31/64", 1/2", can meet more needs
M35 Cobalt Drill Bit: The M35 cobalt drill bit is a durable, sharp and robust drill bit suitable for cutting stainless steel, iron castings, copper, aluminum and other soft metals as well as plastics, wood etc
Quick and Efficient: The cobalt drill bit set can be used effectively on most soft and hard objects, with a 135 degree point tip and twist design for faster cutting, self-centering to prevent walk-off and faster chip and particle removal
HSS Drill Bit Set: HSS Jobber Length Drill Bit Kit for hardened steel with excellent cutting performance. 29 sets of drill bits for long term use. The inserts are hardened and polished for improved sharpness and precise cutting without wobbling
Easy Storage: The drill set includes drill holders with size indexes and is packaged in a small, strong package for easy storage and sorting. If you have any questions, please refer to us and we will be happy to help you

Check Price

Main Highlights

Various Sizes: 29 sets of drill bits include 1/16", 5/64", 3/32", 7/64", 1/8", 9/64", 5/32", 11/64", 3/16", 13/64", 7/32", 15/64", 1/4", 17/64", 9/32", 19/64", 5/16", 21/64", 11/32", 23/64, 3/8", 25/64", 13/32", 27/64", 7/16, 29/64, 15/32", 31/64", 1/2", can meet more needs
M35 Cobalt Drill Bit: The M35 cobalt drill bit is a durable, sharp and robust drill bit suitable for cutting stainless steel, iron castings, copper, aluminum and other soft metals as well as plastics, wood etc
Quick and Efficient: The cobalt drill bit set can be used effectively on most soft and hard objects, with a 135 degree point tip and twist design for faster cutting, self-centering to prevent walk-off and faster chip and particle removal
HSS Drill Bit Set: HSS Jobber Length Drill Bit Kit for hardened steel with excellent cutting performance. 29 sets of drill bits for long term use. The inserts are hardened and polished for improved sharpness and precise cutting without wobbling
Easy Storage: The drill set includes drill holders with size indexes and is packaged in a small, strong package for easy storage and sorting. If you have any questions, please refer to us and we will be happy to help you

8.3

Very Good

Drill America

Drill America 29 Piece Cobalt Stepped Point Drill Bit Set in Round Case w/Gold Oxide Finish for Drilling Acrylic, Steel, Hard Metals, Sizes 1/16" to 1/2" x 64ths, GSC Series ZMGSC29J-PC

Main Highlights

GOLD STEPPED POINT COBALT: Drill America GSC Series Gold Stepped Point Cobalt Drill Bits start easier, drill faster, increase lifespan, and reduce heat compared to standard drill bits
BEST USES: This 29pc set comes with storage holder case and can be used as an enlarger for existing holes or to create new, smoother holes for multi material drilling in acrylic, steel, brass and other hardened metals
135 DEGREE CUTTING ANGLE: These drill bits have a 135 degree split point tip and 3 -flat shank to prevent spinning; Sizes 11/64" and smaller have a round shank; Drill Bits have a gold oxide finish and jobber length
INCH SIZES INCLUDED: 1/16, 5/64, 3/32, 7/64, 1/8, 9/64, 5/32, 11/64, 3/16, 13/64, 7/32, 15/64, 1/4, 17/64, 9/32, 19/64, 5/16, 21/64, 11/32, 23/64, 3/8, 25/64, 13/32, 27/64, 7/16, 29/64, 15/32, 31/64 and 1/2
ABOUT DRILL AMERICA: Drill America specializes in supplying a full line of industrial and contractor cutting tools since 1923; Our products include drills, taps and dies, reamers, end mills, carbide burs, countersinks and more

Check Price

Main Highlights

GOLD STEPPED POINT COBALT: Drill America GSC Series Gold Stepped Point Cobalt Drill Bits start easier, drill faster, increase lifespan, and reduce heat compared to standard drill bits
BEST USES: This 29pc set comes with storage holder case and can be used as an enlarger for existing holes or to create new, smoother holes for multi material drilling in acrylic, steel, brass and other hardened metals
135 DEGREE CUTTING ANGLE: These drill bits have a 135 degree split point tip and 3 -flat shank to prevent spinning; Sizes 11/64" and smaller have a round shank; Drill Bits have a gold oxide finish and jobber length
INCH SIZES INCLUDED: 1/16, 5/64, 3/32, 7/64, 1/8, 9/64, 5/32, 11/64, 3/16, 13/64, 7/32, 15/64, 1/4, 17/64, 9/32, 19/64, 5/16, 21/64, 11/32, 23/64, 3/8, 25/64, 13/32, 27/64, 7/16, 29/64, 15/32, 31/64 and 1/2
ABOUT DRILL AMERICA: Drill America specializes in supplying a full line of industrial and contractor cutting tools since 1923; Our products include drills, taps and dies, reamers, end mills, carbide burs, countersinks and more

8.1

Very Good

Crosstar

Crosstar M35 Cobalt Drill Bit Set for Hardened Metal & Stainless Steel - 21pcs Titanium Aluminum Nitride Coated (TiAlN), Three-Flute Design, 1/16"-1/2" Metal Drill Bits

Main Highlights

Engineered for Hardened Metals with M35 Cobalt Steel Crafted from premium M35 cobalt high-speed steel (5% cobalt), these bits are specifically designed to tackle the tough materials, including stainless steel, hardened cast iron, high-carbon steel, and titanium alloys, with effective drilling hardness up to 60 HRC.
TiAlN Coating for Extreme Heat Resistance & Extended Life The Titanium Aluminum Nitride (TiAlN) nano-coating withstands cutting temperatures up to 1472°F (800°C), drastically reducing heat buildup and friction. This results in a significantly longer tool life compared to standard titanium nitride or oxide coatings.
Triple-Flute Design: Smother Finish, Faster Drilling, Pinpoint Accuracy The innovative three-flute geometry provides three key advantages over conventional two-flute bits: superior hole roundness and wall finish, approximately 40% improved chip ejection for cooler operation, and enhanced drilling accuracy with reduced bit walk. For optimal performance, recommended for standard depth of cut applications.
Three-Flat Shank for Maximum Grip & Zero Slip The precision-machined three-flat shank ensures a complete lock in the drill chuck, eliminating spin-out even under high-torque conditions from impact drivers and heavy-duty drills. This guarantees full power transfer and safer operation.
Comprehensive 21-Piece Professional Set This ready-to-use set includes 21 essential sizes from fine 1/16" to heavy-duty 1/2", covering over 90% of common metal drilling tasks. *Note: Bits 1/16" through 7/64" feature a precision two-flute design for delicate work, while sizes 3/32" and up utilize the performance triple-flute design.*

Check Price

Main Highlights

Engineered for Hardened Metals with M35 Cobalt Steel Crafted from premium M35 cobalt high-speed steel (5% cobalt), these bits are specifically designed to tackle the tough materials, including stainless steel, hardened cast iron, high-carbon steel, and titanium alloys, with effective drilling hardness up to 60 HRC.
TiAlN Coating for Extreme Heat Resistance & Extended Life The Titanium Aluminum Nitride (TiAlN) nano-coating withstands cutting temperatures up to 1472°F (800°C), drastically reducing heat buildup and friction. This results in a significantly longer tool life compared to standard titanium nitride or oxide coatings.
Triple-Flute Design: Smother Finish, Faster Drilling, Pinpoint Accuracy The innovative three-flute geometry provides three key advantages over conventional two-flute bits: superior hole roundness and wall finish, approximately 40% improved chip ejection for cooler operation, and enhanced drilling accuracy with reduced bit walk. For optimal performance, recommended for standard depth of cut applications.
Three-Flat Shank for Maximum Grip & Zero Slip The precision-machined three-flat shank ensures a complete lock in the drill chuck, eliminating spin-out even under high-torque conditions from impact drivers and heavy-duty drills. This guarantees full power transfer and safer operation.
Comprehensive 21-Piece Professional Set This ready-to-use set includes 21 essential sizes from fine 1/16" to heavy-duty 1/2", covering over 90% of common metal drilling tasks. *Note: Bits 1/16" through 7/64" feature a precision two-flute design for delicate work, while sizes 3/32" and up utilize the performance triple-flute design.*

Value for Money

5% Off

8.1

Very Good

SEDIANAS

Cobalt Drill Bit Set - 29Pcs M35 HSS Twist Drill Bits for Hardened Metals, Stainless Steel, Cast Iron and Wooden Plastics with Metal Index Storage Box, 1/16"-1/2"

5% Off

Main Highlights

M35 Cobalt Drill Bit: Premium High Speed Steel M35 (Cobalt 5%) offers superior heat resistance and greater hardness compared to ordinary drill bits. It can extend the tool's service life when drilling hard materials.
135° Split Point Design: The cobalt drill bit set can be used effectively on most soft and hard objects, with a 135 degree point tip with round straight shank, self-centering to prevent walk-off, make drilling precise and faster.
Efficient Drilling: Fully Ground twist design helps clear particles faster, decreases friction and heat for a cooler drilling performance.
Various Sizes: 29 sets of drill bits include "1/16"5/64"3/32"7/64"1/8"9/64"5/32"11/64"3/16"13/64"7/32"15/64"1/4"17/64"9/32"19/64"5/16"21/64"11/32"23/64"3/8"25/64"13/32"27/64"7/16"29/64"15/32"31/64"1/2", can meet more needs.
Widely Used: M35 Cobalt High Speed Steel is more suitable for tough, high tensile strength material. Particularly successful in cutting harden metals such as stainless steel, cast iron, high temperature alloy, titanium alloy, hard plastics and woods.
Set Includes: The set includes 29Pcs (1/16"-1/2") Cobalt Drill Bits, This cobalt drill bit also includes the drill bit holder with size index for easy storage and organizing.

Check Price

Main Highlights

M35 Cobalt Drill Bit: Premium High Speed Steel M35 (Cobalt 5%) offers superior heat resistance and greater hardness compared to ordinary drill bits. It can extend the tool's service life when drilling hard materials.
135° Split Point Design: The cobalt drill bit set can be used effectively on most soft and hard objects, with a 135 degree point tip with round straight shank, self-centering to prevent walk-off, make drilling precise and faster.
Efficient Drilling: Fully Ground twist design helps clear particles faster, decreases friction and heat for a cooler drilling performance.
Various Sizes: 29 sets of drill bits include "1/16"5/64"3/32"7/64"1/8"9/64"5/32"11/64"3/16"13/64"7/32"15/64"1/4"17/64"9/32"19/64"5/16"21/64"11/32"23/64"3/8"25/64"13/32"27/64"7/16"29/64"15/32"31/64"1/2", can meet more needs.
Widely Used: M35 Cobalt High Speed Steel is more suitable for tough, high tensile strength material. Particularly successful in cutting harden metals such as stainless steel, cast iron, high temperature alloy, titanium alloy, hard plastics and woods.
Set Includes: The set includes 29Pcs (1/16"-1/2") Cobalt Drill Bits, This cobalt drill bit also includes the drill bit holder with size index for easy storage and organizing.

Discover top deals and categories on Amazon Check Deals