by Bosch
Buy new: $6.48
2 used & new from $2.86
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Bosch cobalt drill bits offer the best heat resistance and rigid thick web design for drilling in extremely hard and abrasive materials such as treated stainless steel (precipitation-hardened), cast iron and titanium.
Bosch CO2143 1/4" Cobalt Drill Bit. Cobalt formulation provides overall bit hardness of 66-68 HRC for penetration of very tough abrasive materials. Able to withstand very high temperature drilling applications for extended periods of time. Under high drilling temperatures bits stay sharper longer than standard HSS. Thicker web increases rigidity in hard materials. 135 degree split point starts drilling on contact. No walking or skating
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