Cobalt Bit 7/16″

Bosch CO2155, 7/16 Inch Cobalt Drill Bit.
Designed for durability, high heat resistance. Hardened surface for stainless steel, cast iron, titanium, light-gauge metal and aluminum. Gold oxide is a thinner oxide surface treatment than black oxide typically used to identify cobalt steel tools and the performance is similar to uncoated tools. When run in a counterclockwise direction (right-hand cut) spiral fluted tools evacuate chips up and out of the cut to reduce clogging. Ideal for portable or machine drilling.