Review on 🔩 Bosch CO2143 High-Speed Cobalt Drill Bit by Adam Rogers

Replaced a turbocharger on an older car and it had a screw that wouldn't move. I broke my head trying to unscrew the screw so I decided it was time to drill it out. First, I went to a major hardware store and bought a Milwaukee 1/4 Cobalt bit that was rated for hard stealing. It didn't take long for the tip of this blade to become worn and rounded. After reading reviews of the Revain I decided to try the corresponding Bosch 1/4 bit. A hardened steel bolt could be drilled through without any problems. The racket remained intact after use. Well made product that does what it promises.