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populardand1 posted Nov 02, 2025 07:29 PM
populardand1 posted Nov 02, 2025 07:29 PM

BOSCH Cobalt Drill Bits CO21B 21-Piece Set - $47.99

$48

$60

20% off
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BOSCH cobalt drill bit set - 21 pcs. Sizes from 1/16" to 1/2". Split points on bits 1/8 In. and larger to reduce skating when starting. 8% cobalt alloy - good for drilling hard metal.

Not a huge discount, but under $50 for 21-piece 8% cobalt set with 1/2" largest bit isn't bad. Been waiting a while to get a cobalt set, so I'm biting.

Amazon:
https://www.amazon.com/gp/product/B07Q64LTFB

Home Depot:
https://www.homedepot.com/p/Bosch.../308186891
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Product Info
Community Notes
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BOSCH cobalt drill bit set - 21 pcs. Sizes from 1/16" to 1/2". Split points on bits 1/8 In. and larger to reduce skating when starting. 8% cobalt alloy - good for drilling hard metal.

Not a huge discount, but under $50 for 21-piece 8% cobalt set with 1/2" largest bit isn't bad. Been waiting a while to get a cobalt set, so I'm biting.

Amazon:
https://www.amazon.com/gp/product/B07Q64LTFB

Home Depot:
https://www.homedepot.com/p/Bosch.../308186891

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Model: Cobalt M42 Drill Bit Set with Case (21-Piece)

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Sort: Lowest to Highest | Last Updated 12/13/2025, 04:16 AM
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The Home Depot$47.69

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12 Comments

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Nov 03, 2025 03:15 AM
272 Posts
Joined Mar 2022
Aaron15KCNov 03, 2025 03:15 AM
272 Posts
Hard Pass
Nov 03, 2025 03:30 AM
73 Posts
Joined Apr 2022
vVvINFINITYvVvNov 03, 2025 03:30 AM
73 Posts
Quote from Aaron15KC :
Hard Pass
Why's that?
Nov 03, 2025 03:46 AM
272 Posts
Joined Mar 2022
Aaron15KCNov 03, 2025 03:46 AM
272 Posts
Quote from vVvINFINITYvVv :
Why's that?
Same bits by DeWalt is half that price at Lowes and the above exact same ones at HD online are even cheaper
1
Nov 03, 2025 05:08 AM
874 Posts
Joined Feb 2010
rotarypower101Nov 03, 2025 05:08 AM
874 Posts
Quote from Aaron15KC :
Same bits by DeWalt is half that price at Lowes and the above exact same ones at HD online are even cheaper
Are they explicitly M42 ?Link?
1
Nov 03, 2025 05:32 AM
161 Posts
Joined Jan 2007
bradnykNov 03, 2025 05:32 AM
161 Posts
Really good deal. It's been a long time since these have been discounted much.
1
Nov 03, 2025 12:25 PM
71 Posts
Joined Aug 2009
sparky129Nov 03, 2025 12:25 PM
71 Posts
Quote from Aaron15KC :
Same bits by DeWalt is half that price at Lowes and the above exact same ones at HD online are even cheaper
Wrong
1
Nov 04, 2025 02:45 AM
1,203 Posts
Joined Nov 2016
shigro420Nov 04, 2025 02:45 AM
1,203 Posts
These seem to be insanely expensive at this price. Also, since when is cobalt shiny gold?
1

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Nov 04, 2025 05:22 AM
999 Posts
Joined May 2005
deltadNov 04, 2025 05:22 AM
999 Posts
Bought the 14pc set a while back. Projectfarm rated these very well
Nov 04, 2025 05:51 PM
780 Posts
Joined Dec 2008
fattyw2by4Nov 04, 2025 05:51 PM
780 Posts
Cobalt bits are legit. Helped me pre-drill the holes required for my techno-metal post supports. They were the only bits that worked for me. Definitely recommend having a set, even if it's not this particular one.
1
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Nov 04, 2025 07:23 PM
5,368 Posts
Joined Feb 2019
GimmeYoTotsNov 04, 2025 07:23 PM
Pro
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This user is an Expert in Home & Home Improvement
5,368 Posts
Top performer on Project Farm. Also, the same bits are definitely not available from DeWalt.
1
Nov 05, 2025 07:37 PM
2,552 Posts
Joined Jun 2005
Samuel1613Nov 05, 2025 07:37 PM
2,552 Posts
Quote from Aaron15KC :
Same bits by DeWalt is half that price at Lowes and the above exact same ones at HD online are even cheaper
I think you think "Metal Drill Bit" means a "Metal" Drill Bit... a drill bit MADE of metal, in which case Harbor Freight, Lowes, Home Depot, Ace, and pretty much anywhere has "Metal" Drill bits for far cheaper, you are correct. However these are "Metal Drill" Bits, they are formulated to drill through metal specifically by having cobalt as part of their make up, they are expensive as F and do a good job at what they are bullt for.
Nov 13, 2025 09:48 AM
3,334 Posts
Joined Sep 2007
fewlioNov 13, 2025 09:48 AM
3,334 Posts
anyone know how these bits fare in consumer reports review / drill bit roundup article?

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