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  • VIDEO
Premium Cobalt Drill Bits for Stainless Steel and Hard MetalSTROTON
  • STROTON Cobalt Drill Bit Set (1/16-1/4 Inch, 13PCS), M35 High Speed Steel Twist Drill Bits for Stainless Steel, Hard Metal, Cast Iron, Plastic and Wood
  • To view this video, download

STROTON Cobalt Drill Bit Set (1/16-1/4 Inch, 13PCS), M35 High Speed Steel Twist Drill Bits for Stainless Steel, Hard Metal, Cast Iron, Plastic and Wood

4.4 out of 5 stars 601 ratings
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Material High Speed Steel (HSS), Stainless Steel, Cobalt Steel, Cobalt
Finish type Hardened
Shank type 3-Flat
Cutting angle string 135 Degrees
Brand STROTON

About this item

  • 【Premium True 5% Cobalt Steel with 68 HRC】- The Marked Cobalt Content of Ordinary Drill Bits May be False, but This Drill Bits Set is Made of Cobalt Ore from Our Own Mine, Which Indeed Contains 5% Cobalt. Although the Cost and Price are Slightly Higher, It Usually is able to Provide 3X Heat,Wear and Chip Resistance and 3X Tool Life.
  • 【Split Point Design and Fully Ground Process】- Compared with Other Ordinary Drill Bits, This Drill Bits Set is Particularly Suitable for Heavy Duty Work, Such as Cutting through Stainless Steel,Steel Plate,Iron Sheet, Cast Iron and Hardwood, and Drilling Out Bolts Studs and Screws.
  • 【3X Efficiency + 3X Tool Life】- This Cobalt High Speed Steel Drill Bits Set is Typically Capable of Running 3 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.
  • 【Sharp Drill Bit Edge】- This Kind of Drill Bits Beast Can Even Cut Hardened Metal into Long Iron Bars, While a Dull Drill Bit Can Just Slowly Wear Through Metal.
  • 【13 Pieces Jobber Length Industrial Drill Bits Includes】: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 [DIA 1/64 Inch Increments]
› See more product details

Product details

  • Product Dimensions ‏ : ‎ 17.78 x 7.62 x 1.75 cm; 140 g
  • Date First Available ‏ : ‎ Dec 3 2022
  • Manufacturer ‏ : ‎ STROTON Ltd
  • ASIN ‏ : ‎ B0BNCKB8DR
  • Item model number ‏ : ‎ M35-Co5-inch-S
  • 鶹 Rank: #11,501 in Tools & Home Improvement (See Top 100 in Tools & Home Improvement)
  • Customer Reviews:
    4.4 out of 5 stars 601 ratings

Product Description

Why Choose Premium STROTON Cobalt Drill Bits?

Researches have shown that compared with HSS without cobalt, HSS with cobalt has higher temperature resistance, red hardness, wear resistance and heat treatment response.

  • Red hardness, which means that the drill bits hardened steel can maintain hard at 860-880℃.
  • 68 HRC,it means that the drill bits has 3X cutting ability and 3X durability.
  • This drill bits set is made of True Premium Cobalt (80,000 dollars per ton).

bits
cobalt

Truly Made of 5% Cobalt Alloy Steel

  • This drill bits set definitely have more cobalt in them than the "Cobalt" bits that HF sells--which are just Cobalt coated or only a tiny amount of cobalt tipped.
  • Compared with ordinary high speed steel, 5% cobalt provides better heat and wear resistance,and Hold up Better.

drill holes

3X Drilling Efficiency + 3X Tool Life

  • Split Point design tip starts drilling immediately with less force and eliminates "walking" across the work surface.
  • Ideal for Stainless steel,Mild Steel,Iron,Hardmetal,Aluminum,Copper,Plastic and Hardwood.
  • The drill bit can be used for mechanical maintenance, such as drilling out bolts and screws.

cobalt drill bits set for stainless steel and metal

Be vertical to the workpiece

  • Non-vertical use may cause the drill bit to break.
  • Using a drill press with sufficient power will make drilling easier.

low speed

Low speed: 200 to 1000 RPM

  • Too high speed may burn the bit tip.
  • Drill diameter≤3/16，RPM（1000~700）
  • 3/16-3/8，Rʲ（700350）
  • 3/8-1/2，Rʲ（350200）

cool down

Use cutting fluid

  • Add stainless steel tapping oil or engine oil to prevent the stainless steel from overheating.
  • It also works adding some vinegar,soy sauce or water.

bits

Remain steady and patient

  • The drilling shall be started slowly by applying force slowly and gently until the drill bit starts chipping.

STROTON Ture Cobalt Steel Products for Stainless Steel, Hard Metal, and Wood.

1/16-1/4 Inch (13PCS)

Buying Options

1/16-3/8 Inch (21PCS)

1/16-1/2 Inch (17PCS)

1mm-10mm (19PCS)

4mm-32mm (15 Steps)

Metric Drill Bits

Customer Reviews
4.4 out of 5 stars 601
4.4 out of 5 stars 194
4.5 out of 5 stars 437
4.2 out of 5 stars 4,005
4.4 out of 5 stars 1,006
4.4 out of 5 stars 414
Cobalt
5% Cobalt 5% Cobalt 5% Cobalt M42 8% Cobalt 5% Cobalt M42 8% Cobalt
Measurement System
SAE (inch size) SAE (inch size) SAE (inch size) Metric Metric Metric
Ideal for
Stainless Steel,Hard Metal Stainless Steel,Hard Metal Stainless Steel,Hard Metal Stainless Steel,Hard Metal Stainless Steel,Hard Metal Stainless Steel,Hard Metal
Brand
STROTON STROTON STROTON STROTON STROTON STROTON
Type
Right Hand Right Hand Right Hand Right Hand Right Hand Right Hand

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4.4 out of 5 stars
601 global ratings

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Top reviews from Canada

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  • dumitru stoica
    5.0 out of 5 stars Good product
    Reviewed in Canada on May 26, 2025
    Verified Purchase
    Right as described
    Helpful
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  • Dominic Levasseur
    5.0 out of 5 stars Wow
    Reviewed in Canada on July 8, 2025
    Verified Purchase
    Excellent foret, dure 3 fois plus longtemps que mes forêts habituel pour percer du stainless steel.
    Helpful
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  • Mike
    4.0 out of 5 stars Not has advertised
    Reviewed in Canada on June 20, 2025
    Verified Purchase
    These won't drill through stainless steel
    Helpful
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  • Jean Bellerive
    5.0 out of 5 stars Top qualité
    Reviewed in Canada on December 4, 2024
    Verified Purchase
    J'ai percé de l'acier 1/4 en 3 minutes, du stainless 1/8 en moins d'une minute et beaucoup d'autres matériaux au travail et j'ai pas été déçu. Surchauffe pas, perce sans y mettre tout le poids de son corps, mais faut savoir aussi qu'il ne faut pas y aller à pleine vitesse sur ta perceuse pour les non-initiés. Lentement mais sûrement. Thumbs Up.
    One person found this helpful
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  • 鶹 Customer
    5.0 out of 5 stars Works great.
    Reviewed in Canada on June 25, 2025
    Verified Purchase
    Good drill bit set.
    Helpful
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  • Patrick C
    5.0 out of 5 stars Did the job easily and well
    Reviewed in Canada on May 31, 2025
    Verified Purchase
    Worked perfectly to drill precise holes in a steel door frame that none of my other drill bits could penetrate.
    Helpful
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  • M Clement Hall
    5.0 out of 5 stars Bits that bite
    Reviewed in Canada on May 12, 2025
    Verified Purchase
    I had to drill through a steel sheet and the bits I had were inadequate
    With these bits I had my job done in quick order
    Happiness is a drill bit that makes holes
    Helpful
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  • Ali Saker
    4.0 out of 5 stars Drill hard metal
    Reviewed in Canada on May 29, 2025
    Verified Purchase
    Good
    Helpful
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Top reviews from other countries

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  • Michou
    5.0 out of 5 stars Mèche acier
    Reviewed in France on June 12, 2025
    Verified Purchase
    Très bonne mèche
    Report
  • Ray
    5.0 out of 5 stars Drill bits
    Reviewed in the United States on May 19, 2025
    Verified Purchase
    Good value, nice size, functionality, got these to replace the small ones that were broken in my old set.
    Report
  • anna
    5.0 out of 5 stars Lavoro
    Reviewed in Italy on November 30, 2024
    Verified Purchase
    Perfette per i vari lavori da fare in casa marito pienamente soddisfatto
    Report
  • Mandan Daniel Marsh
    5.0 out of 5 stars Perfecto, recomiendo al 100%
    Reviewed in Spain on July 14, 2025
    Verified Purchase
    Han sido perfectas las brocas estas para taladrar un tornillo que se había roto en una culata que estoy arreglando, precisión, corte de material duro, y rapidez TODO perfecto !! Si pudiera dar 10 estrellas las daba
    Report
  • norman bunyard
    5.0 out of 5 stars unlike some that say it will drill hardened steel this drill this one did.
    Reviewed in the United Kingdom on June 26, 2025
    Verified Purchase
    went through steel very easily easy to drill
    Report