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expiredHonest-IJM posted Nov 25, 2022 10:18 PM
expiredHonest-IJM posted Nov 25, 2022 10:18 PM

BOSCH CO21B 21 Pc. Cobalt M42 Drill Bit Set 1/2"-1/16" $46.81

$47

Amazon
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This set averages about $59 according to the CCC price tracker, and this is the Best price so far.
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.
(2) 1/16", (2) 5/64", (1) 3/32", (1) 7/64", (2) 1/8", (1) 9/64", (1) 5/32", (1) 11/64", (2) 3/16", (1) 13/64", (1) 7/32", (1) 15/64", (2) 1/4", (1) 5/16", (1) 3/8", (1) 1/2"

https://smile.amazon.com/gp/produ...=UTF8&th=1
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Deal Details
Community Notes
About the Poster
This set averages about $59 according to the CCC price tracker, and this is the Best price so far.
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.
(2) 1/16", (2) 5/64", (1) 3/32", (1) 7/64", (2) 1/8", (1) 9/64", (1) 5/32", (1) 11/64", (2) 3/16", (1) 13/64", (1) 7/32", (1) 15/64", (2) 1/4", (1) 5/16", (1) 3/8", (1) 1/2"

https://smile.amazon.com/gp/produ...=UTF8&th=1

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

Deal History 

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Current Prices

Sort: Lowest to Highest | Last Updated 11/3/2025, 08:43 PM
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Amazon$47
The Home Depot$47.99

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6 Comments

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Pro
Sr. Deal Editor
Nov 25, 2022 10:21 PM
75,168 Posts
Joined Feb 2006
iconian
Pro
Sr. Deal Editor
Nov 25, 2022 10:21 PM
75,168 Posts
I had this 1 in cart for a long time.. and ya, it's about $60. I ended up buying smaller set when it dropped from $30 to $25. Nice deal!
Nov 26, 2022 02:16 AM
14 Posts
Joined May 2022
EfficientScent843Nov 26, 2022 02:16 AM
14 Posts
It looks like this may be the best price it's ever been on Amazon. Was disappointed by no good BF sales for cobalt drill bits. I'm in for one!
Last edited by SliQwick November 25, 2022 at 07:19 PM.
Nov 27, 2022 03:10 PM
322 Posts
Joined Mar 2020
schneemsNov 27, 2022 03:10 PM
322 Posts
I got CO14B for $26. This is the same product but more bits?
Original Poster
Nov 27, 2022 07:56 PM
2,871 Posts
Joined Oct 2020
Honest-IJM
Original Poster
Nov 27, 2022 07:56 PM
2,871 Posts
Quote from schneems :
I got CO14B for $26. This is the same product but more bits?
Yes, this has 7 more bits. Mostly duplicates of common sizes...
Nov 29, 2022 01:42 AM
112 Posts
Joined Sep 2011
Brian1980Nov 29, 2022 01:42 AM
112 Posts
Quote from EfficientScent843 :
It looks like this may be the best price it's ever been on Amazon. Was disappointed by no good BF sales for cobalt drill bits. I'm in for one!
No kidding, I was holding off to get a new set but have been disappointed
Dec 01, 2022 02:20 AM
191 Posts
Joined Apr 2011
oldgrowthDec 01, 2022 02:20 AM
191 Posts
These are great great great! Just don't go fast fast fast. Go slow, don't heat them up going fast like I did to one of my bosch m42 bits. It got dull. Others still cut through steel and cast iron like butter. Anyway, in for one!
Got an error trying to give a well deserved rep Frown Something about meeting to spread the love before I can give yet more rep to op.
Last edited by oldgrowth November 30, 2022 at 07:24 PM.

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