Review on 🔩 Cobalt Drill Bit by Bosch: CO2151 by Joseph Harkins

I had a broken stainless steel bolt on my car's exhaust system that needed to be removed. I've tried all my drill bits but none drilled through stainless steel. I bought a set of cobalt drill bits from Bosch, successfully drilled out the screw and completed the exhaust system repair. I found I needed a bit of lubrication to allow the bit to cut into the stainless steel stud. These are excellent quality drill bits.