Review on Bosch CO2135 2-3 Cobalt Drill Bit by Gary Duncan

This drill bit is essential for my jewelry use. This is one of the few drill bits I can use to drill through stainless steel. Work slowly, use Cut Lube and water spray to prevent the drill from overheating on thicker parts. Once the tip turns red, the stroke isn't as effective and I need to change it. I usually buy 10 and use titanium bits when not working with stainless steel.