Cobalt Jobber Length Drills (COBALT DRILL BIT R10CO 9/64)

COBALT DRILL BIT R10CO 9/64|More heavily constructed, size for size, than general-purpose designs. For use with the harder, toughter alloy steels of stainless or manganese types, castings, forgings and chilled cast iron. These drills can be run approximately 25% faster than those of high speed steel, because of cobalt steel’s ability to withstand higher cutting temperatures. They should be used in a heavy-duty setup with positive power feed, capable of producing heavy, uniform point pressure. These bits have a 135° split point with a straight shank. Bits shown below are in fractional measures.