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  • Bosch CO14B 14 Pc. Cobalt M42 Drill Bit Set
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Bosch CO14B 14 Pc. Cobalt M42 Drill Bit Set

4.6 out of 5 stars 2,370 ratings
To see product details, add this item to your cart. You can always remove it later.

Purchase options and add-ons

Material Cobalt
Finish type Titanium
Shank type 3-Flat
Cutting angle string 135 Degrees
Brand Bosch

About this item

  • 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
  • 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

Frequently bought together

Bosch CO14B 14 Pc. Cobalt M42 Drill Bit Set
This item: Bosch CO14B 14 Pc. Cobalt M42 Drill Bit Set
$59.98($4.28/count)
Get it by Tuesday, Jul 22
In Stock
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NordWolf 5-Piece M35 Cobalt Stubby Drill Bit Set for Stainless Steel & Hard Metals, with 1/4" Hex Shank for Quick Chucks & Im
$36.99($7.40/count)
Get it by Tuesday, Jul 22
In Stock
Sold by NordWolf Tools and ships from 鶹 Fulfillment.
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From the manufacturer

M42 Cobalt Metal Drill Bits
CO14B M42 Cobalt Drill Bit Set

Hard-Core M42 Alloy Cobalt Drill Bits

Bosch Cobalt M42 Metal Drill Bits are engineered with an upgraded M42 alloy, containing 8% cobalt. These hard-core cobalt bits deliver 10X life vs. standard bits and are designed for high heat resistance.

M42 Cobalt drilling Steel

Superior Performance

Designed for durability and with high heat resistance for use in stainless steel, cast iron, titanium, light-gauge metal and aluminum.

M42 Cobalt with Core18V

No-Skate Tip

Fast, accurate starts reduce bit walking on material surface.

Bosch M42 Cobalt Drill Bits

M42 Grade Cobalt

10X longer life than standard Cobalt drill bits.

M42 Cobalt Drill Bit

Thick Web-Helix Design

Fast material removal and increased stability.

Product information

Technical Details

Manufacturer ‎Bosch Tools CA
Place of Business ‎Mount Prospect, IL 60056 USA
Part Number ‎CO14B
Parcel Dimensions ‎22.3 x 11.7 x 4.2 cm; 453.59 g
Item model number ‎CO14B
Size ‎14 Pc. Drill Bit Set
Colour ‎Solid Black
Style ‎drill bits
Finish ‎Titanium
Material ‎Cobalt
Item Package Quantity ‎1
Number of Pieces ‎14
Measurement System ‎Inch
Included Components ‎14 Drill Bits; Case
Batteries Included? ‎No
Batteries Required? ‎No
Warranty Description ‎Product Defects Only
Item Weight ‎454 g
Country of origin ‎China

Additional Information

ASIN B07Q9HNTBH
Customer Reviews
4.6 out of 5 stars 2,370 ratings

4.6 out of 5 stars
鶹 Rank
Date First Available May 24 2019

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Bosch CO14B 14 Pc. Cobalt M42 Drill Bit Set

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Product description

Bosch Cobalt M42 metal drill bits are engineered with upgraded M42 alloy, containing 8% cobalt. These hard-core Cobalt bits deliver 10x life vs. Standard bits, are jobber length and withstand high-heat applications. The thick web-helix design delivers fast material removal and increased stability. Bits that are 1/8 in. And larger feature a split point; bits 3/16 in. And larger feature a three-flat shank, for better bit grip. These Cobalt Drill bits provide superior performance in stainless steel and can be used to drill cast iron, titanium and other hard or abrasive metals.

WARNING:

CHOKING HAZARD -- Small parts. Not for children under 3 yrs.

Top Brand: Bosch

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Bosch CO14B 14 Pc. Cobalt M42 Drill Bit Set
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Price$59.98$41.59$22.91$18.14-5%$69.99
Was: $73.99		$54.99
Delivery
Get it by Tuesday, Jul 22
Get it by Thursday, Jul 24
Get it by Tuesday, Jul 22
—
Get it by Tuesday, Jul 22
Get it by Tuesday, Jul 22
Customer ratings
4.64.6 out of 5 stars2,370
4.54.5 out of 5 stars1,464
3.73.7 out of 5 stars15
4.44.4 out of 5 stars378
4.64.6 out of 5 stars585
4.44.4 out of 5 stars2,272
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Customer reviews

4.6 out of 5 stars
2,370 global ratings

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Customers say

Customers like the quality, cutting performance, and ease of use of the drill bits. They mention they drill through hard steel with ease and almost effortlessly. Some also say the bits are durable. However, some customers have mixed opinions on the performance.

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QualityCutting performanceEase of usePerformance
13 customers mention "Quality"13 positive0 negative

Customers are satisfied with the quality of the drill bits. They mention they're durable and appear to cut well.

"...drill out a wheel lug nut they did the job easily probably the best steel drill bits I have used" Read more

"...These are more durable and appear to cut well...." Read more

"Excellent bits. They cut steel very well and as long as you pay attention not to overheat them they'll stay sharp a long time." Read more

"...on drill bits I chose this drill set because of the hardened quality Cobalt M42 and affordable price...." Read more

9 customers mention "Cutting performance"9 positive0 negative

Customers are satisfied with the cutting performance of the drill bits. They mention they drill through hard steel with ease, stainless steel bars, and compressors in seconds. Some say the cutting fluid helps speed up the cutting and cools the bits.

"...I am amazed at how well these drilled the stainless steel bars; quickly and almost effortlessly! I highly recommend these!" Read more

"...for drilling out a snapped bolt in my cars wheel hub, drilled through the metal like butter.. i did snap one, that was user error." Read more

"...These hardened drills did the job quickly and are still sharp." Read more

"...These are more durable and appear to cut well...." Read more

3 customers mention "Ease of use"3 positive0 negative

Customers like the ease of use of the drill bits. They mention they work almost effortlessly and do the job easily. Some say they go in like a hot knife in butter.

"...at how well these drilled the stainless steel bars; quickly and almost effortlessly! I highly recommend these!" Read more

"Purchased these to drill out a wheel lug nut they did the job easily probably the best steel drill bits I have used" Read more

"...These went in like hot knife in butter." Read more

9 customers mention "Performance"6 positive3 negative

Customers have mixed opinions about the performance of the drill bits. Some mention it works very well for regular drilling jobs, while others say it's absolutely useless.

"...from a popular hardware store here in Canada and they worked well for regular drilling jobs...." Read more

"...At the end of the job one bit is probably garbage. One bit can be resharpened. One bit is likely still okay to use for another project...." Read more

"Got these for metal working and fabrication. These worked great, and showed no signs wear so far...." Read more

"They work fine. No issues" Read more

Best drill set to remove damaged or broken hardened steel bolts
5 out of 5 stars
Best drill set to remove damaged or broken hardened steel bolts
This drill set saved the day. My wife’s BMW had a wheel lock bolt that was over torqued and when tried to remove , the tip of lug key broke and jammed in the head . I used a couple of wheel stud extracting tools to no avail. The BMW wheel stud keys are round and hardened steel making the job difficult. I tried drilling with HSS drill bits which were useless. After doing some research on drill bits I chose this drill set because of the hardened quality Cobalt M42 and affordable price. The ultimate hardened drills are carbide and not suitable for hand drilling as they are brittle and will break. These cobalt grade M42 drills drilled slowly through the stud head like butter. Started with 3/16” then 1/4” and finished with 1/2”. If it doesn’t say M42 Cobalt grade Don’t waste your money on anything else.
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Top reviews from Canada

  • ken1
    5.0 out of 5 stars Fabulous drill bits
    Reviewed in Canada on August 17, 2023
    Verified Purchase
    Many years ago I purchased a set of house branded cobalt drill bits from a popular hardware store here in Canada and they worked well for regular drilling jobs. Then I bought some 8mm x 8mm square stainless steel bars from China and these bits would not even try and drill them. After doing some research regarding drilling stainless steel, I found these bits on 鶹 and read the reviews and decided to purchase these. I am amazed at how well these drilled the stainless steel bars; quickly and almost effortlessly! I highly recommend these!
    3 people found this helpful
    Helpful
     Report
  • CSP
    5.0 out of 5 stars Very good quality
    Reviewed in Canada on April 9, 2025
    Verified Purchase
    Purchased these to drill out a wheel lug nut they did the job easily probably the best steel drill bits I have used
    Helpful
     Report
  • Jeremy
    5.0 out of 5 stars Project farm approved lol
    Reviewed in Canada on June 22, 2025
    Verified Purchase
    bought for drilling out a snapped bolt in my cars wheel hub, drilled through the metal like butter.. i did snap one, that was user error.
    One person found this helpful
    Helpful
     Report
  • J
    5.0 out of 5 stars Really good set of drill bits for general use
    Reviewed in Canada on December 2, 2024
    Verified Purchase
    Got these for metal working and fabrication. These worked great, and showed no signs wear so far. These are a good set for general use, and far better performance that the cheap big box store ones.
    Helpful
     Report
  • Janet
    4.0 out of 5 stars No issues
    Reviewed in Canada on July 6, 2024
    Verified Purchase
    They work fine. No issues
    Helpful
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  • Heikki Isomaa
    5.0 out of 5 stars Excellent drill set.
    Reviewed in Canada on October 29, 2024
    Verified Purchase
    Tried drilling out broken exhaust studs with run of the mill drills. They were ineffective and found these excellent hard drills on 鶹. These hardened drills did the job quickly and are still sharp.
    Helpful
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  • Steve Dervs
    5.0 out of 5 stars I will buy again!
    Reviewed in Canada on July 12, 2025
    Verified Purchase
    Drilled several 100 holes-with lubricant-in fence post steel-still sharp. No snapped Drills.
    One person found this helpful
    Helpful
     Report
  • Rita Andersson
    5.0 out of 5 stars Very impressed
    Reviewed in Canada on March 9, 2025
    Verified Purchase
    These drill bits really work. Had a broken bolt in a small engine and tried left handed drill bits and other steel bits but they barely scratched the bolt. These went in like hot knife in butter.
    Helpful
     Report

Top reviews from other countries

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  • Gemma & Daniel Williamson
    5.0 out of 5 stars well worth paying a bit more for quality
    Reviewed in the United Kingdom on May 6, 2025
    Verified Purchase
    Normally use cheap drill bits but all the ones I had really struggled when drilling out a bolt. These ones made my life so much easier and saved me a lot of time. Always use a bit of cutting oil/spray when drilling metal and these are still sharp after use and hardly a scratch on them.
    Report
  • francis siengi
    3.0 out of 5 stars 👍 per forature
    Reviewed in Italy on May 24, 2024
    Verified Purchase
    The media could not be loaded.
    Set abbastanza assortito, forano il metallo senza eccessivi problemi.
    Customer image
    francis siengi
    3.0 out of 5 stars
    👍 per forature

    Reviewed in Italy on May 24, 2024
    Set abbastanza assortito, forano il metallo senza eccessivi problemi.
    Images in this review
    Customer image
    Report
  • Jesus D.P.
    5.0 out of 5 stars Calidad inmejorable
    Reviewed in Spain on May 20, 2025
    Verified Purchase
    Las mejores brocas, que puedes encontrar en el mercado para perforar, el hierro forjado y el acero inoxidable
    Report
  • Client d'鶹
    5.0 out of 5 stars Parfait 👍
    Reviewed in France on June 13, 2025
    Verified Purchase
    Excellente mèches , le top 👌
    Report
  • David
    5.0 out of 5 stars nice and useful
    Reviewed in Singapore on November 8, 2024
    Verified Purchase
    any Bob the Builder types would love them
    Report