10 Best Long Drill Bits Cobalt
#1 Best Pick
Greywolf Cobalt Drill Bit Set, 19 pcs M35 High Speed Steel Twist Drill Bits, Metal Drill Bits for Hard Metal, Stainless Steel, Cast Iron, Wood and Plastic, with Index Box 1.0mm-10.0mm
Brand: greywolf
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- 【Convenient Size Selection】: This 19 pcs M35 drill bit set includes everything you need to meet all your needs, bringing a user-friendly experience. Set includes: 1mm, 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm, 4mm, 4.5mm, 5mm, 5.5mm, 6mm, 6.5mm, 7.5mm, 8mm, 8.5mm, 9mm, 9.5mm, 10mm [1-10mm, in 0.5mm increments].
- 【Industrial Grade M35】: High-speed steel drill bit set, these drill bits contain 5% cobalt, which is much harder than the high-speed steel used in similar drill bit sets. Fully ground drill bits with smooth surface, high grinding precision, and sharp edges can reduce friction between the drill bit and the material and reduce the temperature of the drill bit during operation.
- 【Enhanced Precision Design】: Adopts 135° split point tip for faster penetration and less walking. Deep groove twist drill bit design ensures smooth chip evacuation and stable operation, providing accurate results for demanding work.
- 【Wide Application】: M35 cobalt high-speed steel is more suitable for processing tough, high-tensile strength materials. Especially suitable for cutting hardened metals such as stainless steel, cast iron, high-temperature alloys, titanium alloys, hard plastics and wood. This cobalt drill bit set is a must-have for professionals, amateurs and home improvement enthusiasts.
- 【Wide Application】: M35 cobalt high-speed steel is more suitable for processing tough, high-tensile strength materials. Especially suitable for cutting hardened metals such as stainless steel, cast iron, high-temperature alloys, titanium alloys, hard plastics and wood. This cobalt drill bit set is a must-have for professionals, amateurs and home improvement enthusiasts.
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#2 Best Value
DEWALT DWA1240 Pilot Point Industrial Cobalt Drill Bit Set (14 Piece)
Brand: DEWALT
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- Designed for maximum speed and life
- Pilot point and split tip design
- No bit walking - more user control
- Intended to be used on hard metals
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#3 Budget Pick
MAX-CRAFT HSS Cobalt Drill Bit Double End 5/32 in. Stubby Body Drill Steel Metal Iron-10Pcs
Brand: MAX-CRAFT
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- Cobalt Drill Bit Size: 5/32"(Diameter) x 5/8"( Flute Length) x 2-1/16" (Overall Length)
- Material: HSS cobalt steel is the best material for drilling with the longest life
- Double End Drilling Point:The 2 cutting point of one single drill bit, when one cutting point is used bored and the other cutting end can be used, as another new drill bit to use
- 135 Deg. Split Point Angle: No center punch is needed-- the aggrevsive 135 Deg. Split Point quick-cut points are self-centering and penetrate quickly with less pressure
- Application: Drill through stainless steel, general steetl, metal sheet, iron, copper, aluminum, plastic
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#4 Top Choice
99Pcs Cobalt Drill Bit Set, Professional High Speed Steel Twist Drill Bits, Sturdy Metal Drill Bit Set 1/16" to 3/8" with Plastic Storage Case for Aluminum Alloy and Stainless Steel
Brand: CCJZBCAU
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- Sturdy and Enduring: Efficient drill bit set is constructed of sturdy high speed steel to enhance wear resistance and endurance , the cutting edges are hardened and sharpened to maintain sharpness , suitable for wood , aluminum alloy , stainless steel , plastics and more
- Convenient to Store: Sturdy twist drill bit set is equipped with a hard thick plastic case , and the drill bits are packed in bags for separate storing , which is reasonably designed and safely packaged
- Efficient Use Design: High speed steel cobalt drill bit set adopts 135° split design , fast cutting point auto centering , low pressure , fast penetration , reduce deviation , and twisting design enables smooth removal of impurities
- Wide Range of Applications: Versatile wood drill bit set is very suitable for home improvement , maintenance and handicrafts , equipping with various bits you need for drilling
- Complete Set: The twist bit set contains 16 pieces of 1.5 mm (1/16") bits , 16 pieces of 2 mm (5/64") bits , 15 pieces of 2.5 mm (3/32") bits , 10 pieces of 3 mm (7/64") bits , 10 pieces of 3.2 mm (1/8") bits , 8 pieces of 3.5 mm (9/64") bits , 8 pieces of 4 mm (5/32") bits , 3 pieces with 4.5 mm (11/64") bits , 3 pieces with 5 mm (3/16") bits , 2 pieces with 5.5 mm (7/32") bits , 2 pieces with 6 mm (15/64") bits , 2 pieces with 6.5 mm (1/4") bits , 2 pieces with 8 mm (5/16") bits , 2 pieces with 10 mm (3/8") bits , and a plastic case
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#5 Popular Choice
STROTON Metric M42 8％ Cobalt Twist Drill Bits for Stainless Steel and Hard Metal (11mmx2PCS)
Brand: STROTON
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- Premium M42 8% Cobalt Steel ,68-70 HRC (Rockwell Hardness Scale) ,Usually Give the Best Heat,Wear and Chip Resistance and Long Tool Life.
- 3 Steps Desigh for Cutting through Stainless Steel,Hard Metals,Aluminum,Plastic.
- This Cobalt Drill Bit is Typically Capable of Running Three to Five Times Faster.Despite the Higher Price,the Cost Per Hole When Using Cobalt Drill Bit Will be the Lowest,Since It Can Produce So Many More Holes.
- The Sufficiently Sharp Bit Edge Can Cut the Metal Material into Long Strips of Iron Chips rather than Slowly Grinding Throng the Material with a Blunt Drill Bit.
- Includes :M42 Cobalt drill bit 11mm x 2 (length:14.2cm) 135 Degree Split Point
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#6 Top Pick
Hymnorq 15-Piece M35 Cobalt Drill Bit Set, Metric 1.5 to 10mm, 5% Cobalt HSS for Drilling Hard Metal Stainless Steel Cast Iron, Fully Ground Jobber Length Bits with 135° Split Point Tough Indexed Case
Brand: Hymnorq
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- TRUE M35 GRADE COBALT STEEL: Manufactured from premium High-Speed Steel containing 5% Cobalt (HSS-Co), these bits are heat-hardened to cut through tough abrasive materials. They offer significantly higher heat resistance and wear durability compared to standard HSS bits, making them the ultimate choice for drilling into stainless steel, cast iron, and titanium alloys.
- PRECISION 135° SPLIT POINT: Equipped with a 135-degree self-centering split point, these bits bite into the material immediately upon contact. This active cutting tip prevents "walking" or wandering across the work surface and eliminates the need for a pre-punch pilot hole, ensuring accurate and clean starts every time.
- FULLY GROUND & EFFICIENT: Unlike roll-forged alternatives, our bits are fully ground for precise dimension accuracy and concentricity. The precision-engineered dual twist flute design ensures rapid chip removal, effectively reducing friction and heat buildup for a smoother, cooler drilling process.
- 15PC METRIC SIZE COVERAGE: This comprehensive metric set includes 15 essential sizes: 1.5, 2, 2.5, 3, 3.5, 4, 4.5, 5, 5.5, 6, 6.5, 7, 8, 9, and 10mm. It is a versatile kit suitable for a wide range of projects in metalworking, automotive repair, and general DIY on wood, plastic, aluminum, and hard metals.
- HEAVY-DUTY INDEXED CASE: The bits are housed in a rugged, impact-resistant ABS plastic case with rubberized corners for extra protection. The case features a folding design with clearly marked size indexes (raised lettering) for easy identification, keeping your tools organized, secure, and ready for transport to any job site.
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#7 Top Pick
Metric M42 8% Cobalt Twist Drill Bits Set for Stainless Steel and Hard Metal (1mm-10mm/19pcs)
Brand: STROTON
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- Premium M42 8% Cobalt Steel ,68-70 HRC (Rockwell Hardness Scale) ,Usually Give the Best Heat,Wear and Chip Resistance and Long Tool Life.
- 3 Steps Design for Cutting through Stainless Steel,Hard Metals,Aluminum,Plastic.
- This Cobalt Drill Bit is Typically Capable of Running Three to Five Times Faster.Despite the Higher Price,the Cost Per Hole When Using Cobalt Drill Bit Will be the Lowest,Since It Can Produce So Many More Holes.
- The Sufficiently Sharp Bit Edge Can Cut the Metal Material into Long Strips of Iron Chips rather than Slowly Grinding Throng the Material with a Blunt Drill Bit.
- 19Pcs 135 Degree Split Point Drill Bits Includes :1mm(length:3.4cm) 1.5mm 2mm 2.5mm 3mm 3.5mm 4mm 4.5mm 5mm(length:8.5cm) 5.5mm 6mm(length:9cm) 6.5mm 7mm 7.5mm 8mm(length:11.5cm) 8.5mm 9mm 9.5mm 10mm(length:13cm) [DIA 0.5mm Increments] .
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#8 Top Pick
YIJIZE 150mm Long Drill Bits Set, Diameter 3mm 4mm 5mm 6mm, 4pcs HSS Cobalt Drill Bits, for Hard Metal, Stainless Steel, Cast Iron, Copper, Aluminum, PVC, Plastic, Wood
Brand: YIJIZE
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- 150mm Length: When you meet obstructions or when deep holes are required, the 150mm length drill bits are very useful.
- Four Sizes: Drill bits with diameters 3mm, 4mm, 5mm, 6mm are the most prevalently used sizes. We are confident that this set can fulfill the vast majority of your drilling needs. There is always one correct size right for you this time or next time.
- Cobalt material: These drill bits are made of high-speed steel cobalt, which has excellent hardness and wear resistance, making them an ideal choice for drilling various metals.
- Faster Drilling: The 135-degree point tip enables rapid penetration with less pressure, and the twist design efficiently removes metal shavings.
- Versatile Use: Great for drilling hard metal, stainless steel, cast iron, copper, aluminum alloy, PVC, plastic, wood. Please pay attention to the control of speed, pressure, and heat while drilling.
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#9 Top Pick
Hymnorq M35 Cobalt Steel Fractional 11/64 Inch Dia. x 3.26 Inch Long Twist Drill Bit Set of 10pcs, Jobber Length and Round Shank, 135 Degree Split Point Heat Resistant for Metalworking
Brand: Hymnorq
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- Premium Quality Material: Made from M35 grade cobalt steel (5% cobalt) for enhanced durability and strength, perfect for tough materials.
- Dual Twist Flute Design: Reduces friction, improves chip removal, and provides smoother, more efficient drilling.
- 135° Split Point: Offers faster starts and reduced bit walking for precise and accurate drilling.
- Chamfered Shank End: Provides a secure, stable fit in your drill, reducing slippage during use.
- Convenient Storage: Comes with a tough, transparent PP case for organized storage and easy access to all 10 bits.
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#10 Top Pick
Hymnorq M35 Cobalt Steel Fractional 7/64 Inch Dia. x 2.64 Inch Long Twist Drill Bit 10pc Set, Jobber Length Round Shank, Self-Centering 135 Degree Split Point, Heat Resistant, Ideal for Metalworking…
Brand: Hymnorq
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- COBALT STEEL - Manufactured from M35 grade cobalt steel, with molybdenum and cobalt added to creates a hardened alloy, measuring Rockwell hardness up to 67, for much faster cutting and extra longer life span, with up to twelve times when compared with an average HSS drill bit.
- FOR METALWORKING - Particularly successful in cutting through hard metals(hardness less than HRC38°) such as stainless steel and cast iron, although they can be used for softer materials like copper and aluminium, too. Not for hardened steel / high carbon steel. Try to adjust the RPM when it fails to penetrate.
- PRECISION GROUND - These bits are fully ground so that it's cutting diameter is seriously accurate and the lifespan is prolonged in comparison to non-ground alternatives(roll forged bits). Smooth bit surface allows for nice clean holes.
- 10PC SET - The set includes 10pcs of 7/64” diameter M35 grade cobalt steel twist drill bits, packed in a plastic case for easy storage and carrying. Total lenght: 2.64 inch; working length: 1.46 inch. Manufactured to German DIN338 standard.
- 90 Days Warranty - If you are not fully satisfied for any reason, please contact us for 100% refund or replacement.
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