Compatible Models

The Bosch CO21B 21 pc. Cobalt M42 Drill Bit Set is the correct replacement for the following model numbers.

Description

Cobalt bits with upgraded M42 alloy for long life in hard metalSurface hardened with web-helix design and high heat resistanceDrills stainless steel, cast iron, titanium, other hard metals

Benefits
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
Three-flat shank on bits 3/16 In. and larger
deliver better bit grip
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
Split points on bits 1/8 In. and larger
allow for easy starts with no skating, eliminating the need for a center punch

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