Review on Bosch CO2135 2-3 Cobalt Drill Bit by Ian Krump

These are the strongest parts I have found. They last far longer than any other bit I've used on steel. I tried many and continued to wear down the bits as I built the steel magazine until I did some research and found that cobalt should last a long time. Cobalt pieces weren't available locally, so I bought them here and from Menard. They are taller but slightly larger.