lifeeconomic 
Best results for drill through hardened steel
Migiwata Metric M35 Cobalt Steel Extremely Heat Resistant Twist Drill Bits with Straight Shank Set of 13pcs to Cut Through Hard Metals Such as Stainless Steel and Cast Iron
$14.99
$21.59
Amazon.com
Last update was on: October 18, 2024 8:55 am
- COBALT STEEL - Manufactured from M35 cobalt steel, with molybdenum and cobalt added to creates a hardened alloy, measuring Rockwell hardness up to 67, extremely heat resistant
- for much faster cutting and extra longer life span, with up to twelve times when compared with an average HSS drill bit.
- NO CENTER PUNCH NEEDED - The 135° Quick-Cut points are self-centering and penetrate quickly with less pressure. Will not "walk" or "wander". Straight shank allows for firmly holding and accurate centering, fit for standard drill chucks and regular round collet chucks. Must be used and operated at proper RPMs for maximum efficiency
Irwin Tools3018002 Cobalt M-35 Metal Index Drill Bit Set, 29 Piece
Drill America 29 Piece Heavy Duty High Speed Steel Drill Bit Set with Black and Gold Finish in Round Case (1/16" – 1/2" x 64ths), KFD Series
$49.99
$61.99
Amazon.com
Last update was on: October 18, 2024 8:55 am
- Assortment of 29 jobber length drill bits includes inch sizes 1/16" to 1/2" in 1/64" increments
- High-speed steel (HSS) provides hardness for wear resistance
- Black and gold oxide finish resists corrosion and increases the hardness of the drill bit
- Self-centering 135-degree split point penetrates hard material without a pilot hole and produces small chips to reduce clogging
- Comes in a plastic storage case
COMOWARE Cobalt Drill Bit Set- 15Pcs M35 High Speed Steel Twist Jobber Length for Hardened Metal, Stainless Steel, Cast Iron and Wood Plastic with Indexed Storage Case, 1/16"-3/8"
$19.99
$22.19
Amazon.com
Last update was on: October 18, 2024 8:55 am
- HIGH QUALITY MATERIAL: 5% Cobalt High Speed Steel M35 provide extended tool life compared to ordinary drill bits. Durable and strong
- TWIST DESIGN & PERFORMANCE: PRECISE 135°SPLIT POINT, gold oxide finish and round straight shanks. Prevent walking, clear chips and particles faster.Produced by precision fully ground which ensures chips move smoothly.
- PROFESSIONAL & WIDELY USE: M35 Cobalt HSS is more suitable for hardened material. Particularly successful in cutting through hard metals such as stainless steel, cast iron, high temperature alloy, titanium alloy, hard plastics and woods, and also can be used for softer materials.
CO-Z Step Drill Bits, HSS 5PCS Titanium Step Drill Bit Set, 50 Sizes in 5 High Speed Steel Unibit Drill Bits Set for Sheet Metal with Aluminum Case, Multiple Hole Stepped Up Bits for DIY Lovers
$21.88
$31.73
Amazon.com
Last update was on: October 18, 2024 8:55 am
- Extreme Durabikity: Cobalt high speed steel drill bits along with the titanium coating ensures extreme durability, will stay new and shiny for years to come.
- Different Sizes of Holes Can Be Drilled: Different sized shanks ensure compatibility with 1/4, 3/8 and 1/2 in. chuck sizes. You are capable to drill holes in different sizes which can meet your normal needs.
- Smooth Drilling: 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).
Drill Hog USA 13 Pc COBALT Drill Bit Set Index M42 Drill Bits
HARVET 69-Piece Drill Bit Set for Metal Wood Masonry Plastic Drilling
Amazon.com
Last update was on: October 18, 2024 8:55 am
- 69 piece drill bit set includes 15 piece wood drill bits（from 2mm to 8mm）, 20 piece masonry drill bits（from 1/8" to 5/16"）, 31 piece HSS titanium drill bits（from 1mm to 8mm）and 3 piece spade bits（1/2", 5/8", 3/4"）.
- Drilling bits for use on metal, wood, plastic and masonry.
- Weight: 1.28 pounds. Packed Size: 4 x 6 Inches.
- Bits made from high quality heat-treated steel for long-lasting strength and durability.
Best Choice 8-Piece 1/2” Shank Silver and Deming Drill Bit Set in Aluminum Carry Case, High Speed Steel (HSS) | SAE Size 9/16” – 1” by 1/16th Increment
$27.99
$34.15
Amazon.com
Last update was on: October 18, 2024 8:55 am
- Premium cobalt high speed steel construction for proven capability and durability to drill holes in wood, plastic, aluminum, copper, stainless, sheet metals and many other types of materials
- Superior gold titanium and black nitride dual coating finish holds up lubricant better for smoother drilling, and is 80% more durable and corrosion resistant than regular black enamel finish
- 135° Split point design at tip increases cutting speed with self-centering feature and prevents drill walking or wobbling
set of 3 HSS6542 M2 Steel Spiral Groove Step Drill Bit Set for Stainless Steel Metal Wood Hole
$26.31
$28.94
Amazon.com
Last update was on: October 18, 2024 8:55 am
- Suit for use in hardness under 28 artifacts,(Such as: Stainless steel , iron plate, aluminum, wood )
- You can use water to cooling it when it is work and it can be used for even longer
- 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.
DEWALT Cobalt Drill Bit Set with Pilot Point, 14-Piece (DWA1240)
DEWALT DW1354 14-Piece Titanium Drill Bit Set
1/8-Inch Cobalt Steel M35 Jobber Length Twist Drill Bits for Hard Metal, Stainless Steel, Pack of 12
$15.05
$18.66
Amazon.com
Last update was on: October 18, 2024 8:55 am
- JOBBER LENGTH: 1/8-Inch cutting diameter, 1-5/8-Inch flute length, 2-3/4-Inch overall length, 135 degree split point, straight shank
- MADE FROM HIGH-SPEED STEEL AND 5% COBALT: improve much higher heat resistance because of cobalt steel's high red hardness, provide strong durable performance compared to typical hss drill bits
- CAN BE REPEATEDLY SHARPENED AS NEEDED: cobalt drill bit's hardness is uniform throughout the entire material, so that can be repeatedly sharpened without damaging the cutting edge allowing it to drill more than hss drill bits
