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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

4.7 4.7 out of 5 stars 6,108 ratings

$35.29 $2.52 per Count
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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, 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"

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This item: 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
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Product details

  • Package Dimensions ‏ : ‎ 8.78 x 4.61 x 1.65 inches; 1 Pounds
  • Item model number ‏ : ‎ CO14B
  • Date First Available ‏ : ‎ April 4, 2019
  • Manufacturer ‏ : ‎ BOSCH
  • ASIN ‏ : ‎ B07Q9HNTBH
  • Country of Origin ‏ : ‎ China
  • Customer Reviews:
    4.7 4.7 out of 5 stars 6,108 ratings

WARNING:

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

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.

Top Brand: Bosch

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From the brand


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.

What's in the box

  • 14 Drill Bits; Case
  • Looking for specific info?

    Customer reviews

    4.7 out of 5 stars
    6,108 global ratings

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    Customers say

    Customers find the drill bits to be of good quality. They cut through metals like aluminum and stainless steel easily. The bits are durable and long-lasting, extending their life. Many customers say the bits perform well in all cases and are a great value for money. Customers are also happy with the speed. However, some customers dislike the quality and have differing views on dullness.

    AI-generated from the text of customer reviews

    243 customers mention "Drill bit quality"218 positive25 negative

    Customers like the drill bits. They find them good quality and better than other brands. The case is good, and the bits perform better than standard drill bits. Many consider these a great everyday set when not drilling through concrete.

    "...To sum this up, this is a great drill that should last a long time if used correctly...." Read more

    "Great drill bit. Cut through stainless with ease." Read more

    "Great drill bits, but the case is not good. The latch on my case broke on first opening." Read more

    "...This allowed me to drill straight through both and not have to guess where to drill from on each side." Read more

    208 customers mention "Cutting ability"160 positive48 negative

    Customers appreciate the drill bits' cutting ability. They say the bits keep a sharp cutting edge, giving them quality and ease of use. The bits cut through aluminum, stainless steel, and spot welds effortlessly. Many are impressed with the cutting efficiency and longevity of the bits.

    "...hot and also acts as a "lubricant", both contributing to keeping a sharp cutting edge, giving it quality and ease of use...." Read more

    "...The bit are durable. None have broken and they remain sharp through multiple jobs." Read more

    "...They are worth their weight in gold. Very impressed with cutting efficiency and longevity of the bits...." Read more

    "...Even with a decent hole drilled in the bolt, my extractors won't grab the hard metal...." Read more

    189 customers mention "Durability"146 positive43 negative

    Customers appreciate the drill bits' durability. They find them well-made, long-lasting, and a quality product that extends the life of their drill bits.

    "..."lubricant", both contributing to keeping a sharp cutting edge, giving it quality and ease of use...." Read more

    "...using the 1/4 and 3/8 inch bits. Worked well. The bit are durable. None have broken and they remain sharp through multiple jobs." Read more

    "...Very impressed with cutting efficiency and longevity of the bits. I was able to knock out in one evening what I anticipated would take several days." Read more

    "Great drill bits, but the case is not good. The latch on my case broke on first opening." Read more

    117 customers mention "Works well"117 positive0 negative

    Customers find the drill bits perform well for their needs. They work effectively in drilling through steel and other materials with the triangle shank transferring force effectively.

    "...using the 1/4 and 3/8 inch bits. Worked well. The bit are durable. None have broken and they remain sharp through multiple jobs." Read more

    "Decent price and nicely packaged. No complaints with these bits. I have drilled quite a bit of mild steel with these and they have been great!..." Read more

    "Worked great. Go top speed & they work; go slow and get nowhere. I would definitely recommend this but, especially for stainless steel." Read more

    "...Did it’s job and stayed sharp for next time" Read more

    110 customers mention "Value for money"97 positive13 negative

    Customers appreciate the drill bits' value for money. They say the set size is great for the price, and it's worth the upgrade from black oxide or coated bits.

    "...if you're gonna be using it more than 2 or 3 times, its worth the upgrade from black oxide or a coated bit, thus giving it great value for..." Read more

    "...They are worth their weight in gold. Very impressed with cutting efficiency and longevity of the bits...." Read more

    "Decent price and nicely packaged. No complaints with these bits. I have drilled quite a bit of mild steel with these and they have been great!..." Read more

    "...This Bosch set seemed to be one of the few affordable sets that included the 1/2-in size...." Read more

    27 customers mention "Speed"21 positive6 negative

    Customers are satisfied with the drill bits' speed. They say the drill bits drill holes quickly, punching through materials faster than expected. The drill bits perform well in multiple materials like cordless, drill press, and mill. They drill holes in less than 1 minute per hole, including the pilot hole, using a bit of cutting oil. The drill bits have good performance in mild steel, saving time and money over other options.

    "...Less than 1 minute per hole, including the pilot, using a bit of cutting oil. It really is like magic...." Read more

    "...The Bosch drill bits stand out because they drill through materials much faster and with significantly less effort...." Read more

    "...They are sharp, and they drill pretty fast." Read more

    "...you're doing jobs where changing bits often is the norm, this case will slow you down and add to your frustration over a metal case where bits slide..." Read more

    25 customers mention "Dullness"8 positive17 negative

    Customers have different experiences with the drill bit dulling. Some say it doesn't dull the edges, while others mention it gets dull after drilling a few holes in mild steel or a used mower blade.

    "...then...in no time, after 40 holes in thin walled galvanized pipe it went dull. Good thing I got 2...." Read more

    "...No measurable dullness noticed. Would recommend." Read more

    "Work great for Stainless Steel. Although they dulled a little quicker than anticipated, still worked great." Read more

    "...Past that it seems the bit gets pretty dull...." Read more

    43 customers mention "Quality"0 positive43 negative

    Customers are dissatisfied with the drill bits' quality. They find them not machine-shop quality, and the case is poor. Some say the bits are too dull to work at all after drilling two holes. The bit case is also worthless.

    "Great drill bits, but the case is not good. The latch on my case broke on first opening." Read more

    "...The Dewalt brand did almost double so I will say these are not worth it based on my use and application...." Read more

    "...However, the case is cheap plastic, so trying to properly reinsert bits is hit and miss...." Read more

    "Received on time but product was questionable. The label was upside down on the drill bit case...." Read more

    One tough drill bit for hardened holes!
    5 out of 5 stars
    One tough drill bit for hardened holes!
    I often drill 5/16" holes in some parts I cut on my CNC Plasma cutter. Each part has 8 holes that I cut small and drill to final size. Plasma cut holes have a hardened edge and wrecks inferior drill bits like the one on the right of my photo that I have sharpened so much it is half sized now. This cobalt one went through about 150 of those holes like butter before I had to sharpen it! I was impressed. It is still working great as long as it has a properly sharpened tip.
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    Top reviews from the United States

    • Reviewed in the United States on November 23, 2024
      Size: 9/64 x 2-7/8 Inch (Pack of 1)Verified Purchase
      Anything bosch makes is good, but i feel like they have it down pat when it comes to stuff like twist drills and bits.

      The M42 cobalt keeps the drill from getting too hot and also acts as a "lubricant", both contributing to keeping a sharp cutting edge, giving it quality and ease of use.

      These factors reduce the need for either resharpening, or worst, replacing the drill. The cost of cobalt bits are what scares people away, but if you're gonna be using it more than 2 or 3 times, its worth the upgrade from black oxide or a coated bit, thus giving it great value for money.

      The "M42" is a reference for the amount of cobalt used in the "material makeup" of the bit, with 8% cobalt being used in M42, and 5% cobalt in M35. Both are great options, but i recommend getting an M42 version when possible.

      The use of cobalt doesnt change the size or shape of the drill, although some will have different flute counts and designs, some tips have a "no pilot hole" start and some will have different degrees of an angle at the head to help with different types of material. Overall, storage capacity will not change unless you opt for different lengths, such as mechanics and aviation length.

      To sum this up, this is a great drill that should last a long time if used correctly. Bosch is very prevalent in my drill cabinet, so dont be afraid to spend a little extra and get the good one!
      5 people found this helpful
      Report
    • Reviewed in the United States on October 14, 2024
      Size: 14 pc. Drill Bit SetVerified Purchase
      Got this kit for blacksmith shop.
      I have used it in a hand drill and a drill press.
      I drilled multiple holes in succession in 1/4 , 3/8, and 1/2 inch soft steel.
      using the 1/4 and 3/8 inch bits.
      Worked well. The bit are durable. None have broken and they remain sharp through multiple jobs.
      2 people found this helpful
      Report
    • Reviewed in the United States on October 9, 2024
      Size: 14 pc. Drill Bit SetVerified Purchase
      I bought this set of bits to drill 1/2" holes through 1/4" SS for a project. They are worth their weight in gold. Very impressed with cutting efficiency and longevity of the bits. I was able to knock out in one evening what I anticipated would take several days.
      One person found this helpful
      Report
    • Reviewed in the United States on December 12, 2024
      Size: 5/16 In. X 4-1/2 In.Verified Purchase
      Great drill bit. Cut through stainless with ease.
    • Reviewed in the United States on July 30, 2024
      Size: 14 pc. Drill Bit SetVerified Purchase
      Decent price and nicely packaged. No complaints with these bits. I have drilled quite a bit of mild steel with these and they have been great! I do use cutting oil and correct speed and feed when drilling with them and that can really make a difference in longevity. Wish they had better selection of bits and larger kits.
      One person found this helpful
      Report
    • Reviewed in the United States on June 1, 2024
      Size: 14 pc. Drill Bit SetVerified Purchase
      I never knew the magic of cobalt drill bits until I needed to drill some mounting holes on a steel bench grinder stand. The top of the stand was 3/8 in steel plate and it probably took 20 minutes to get through it with a standard bit.

      I did some research and ordered these bits. I don't need 50 different sizes because I'm not drilling metal frequently. This Bosch set seemed to be one of the few affordable sets that included the 1/2-in size. Plus... All of the bits above 3/16 I have a three-sided flat grind for better chuck lock up.

      Used the 1/4 in bit for a pilot and then the half inch bit to drill the remaining three holes. Less than 1 minute per hole, including the pilot, using a bit of cutting oil. It really is like magic.

      I'll be testing these to drill out a broken bolt in my mower deck next. I will update this review if I experience any durability issues.

      UPDATE: That broken spindle bolt in my mower deck must be special. Using low speed, a lot of pressure, and cutting oil I made it about a quarter inch into the bolt before dulling the bit. Switched to another bit and made it a bit further before killing that one too. Even with a decent hole drilled in the bolt, my extractors won't grab the hard metal. I'm not going to deduct a star since I didn't expect these bits to be invincible but hope this helps someone determine if these will work for your use case.
      8 people found this helpful
      Report
    • Reviewed in the United States on December 30, 2024
      Size: 14 pc. Drill Bit SetVerified Purchase
      Purchased these based on the recommendation and testing by the Project Farm YouTube channel. Haven't had a chance to use them bout they seem well made and packaged.
    • Reviewed in the United States on October 31, 2024
      Size: 1/8 x 2-3/4 Inch (Pack of 1)Verified Purchase
      Worked great. Go top speed & they work; go slow and get nowhere. I would definitely recommend this but, especially for stainless steel.

    Top reviews from other countries

    • Etienne Gallant
      5.0 out of 5 stars High quality drill bit
      Reviewed in Canada on January 2, 2025
      Size: 3/32 x 2-1/4 Inch (Pack of 1)Verified Purchase
      I was able to drill 4 aluminum rivets from a snowblower starter rope assembly easily. This drill bit was strong enough to drill these 4 rivets in no time. I like to use some « gel-tap » to lube the tip of the drill bit and prolong the life of it. It also helps retrieve metal shavings from falling everywhere.
    • Heikki Isomaa
      5.0 out of 5 stars Excellent drill set.
      Reviewed in Canada on October 29, 2024
      Size: 14 pc. Drill Bit SetVerified Purchase
      Tried drilling out broken exhaust studs with run of the mill drills. They were ineffective and found these excellent hard drills on Amazon. These hardened drills did the job quickly and are still sharp.
    • Gordon Wedman
      5.0 out of 5 stars Did the job
      Reviewed in Canada on September 24, 2024
      Size: 3/16 x 3-1/2 Inch (Pack of 1)Verified Purchase
      These worked great to drill the hard metal A pillar in my LR3 that other people reported having trouble drilling. Didn't even need the second one.
    • L
      5.0 out of 5 stars Love that I can buy a single bit.
      Reviewed in Canada on September 23, 2024
      Size: 9/64 x 2-7/8 Inch (Pack of 1)Verified Purchase
      High quantity drill bit to supplement my already complte set. It is longer than the ones in a set. Great when you need to drill a deeper hole.
    • mark holliwell
      5.0 out of 5 stars Works
      Reviewed in Canada on June 30, 2024
      Size: 1/8 x 2-3/4 Inch (Pack of 1)Verified Purchase
      Actually DOES go through steel