Bosch CO4159

1/2" Cobalt Drill Bit

Ability to penetrate exceptionally tough materials
Overall bit hardness of 66-68 HRC from the cobalt formulation
Tough cobalt alloy delivers heat resistance up to 1100-degree Fahrenheit
135-degree split point starts on contact with no walking or skating and no center punch is required
Bit can perform for extended periods of time in the most abrasive materials without failing due to the high heat levels