Century Drill & Tool Cobalt Drill Bit 1/4 Overall Length 4 Made In The U.S.A.

Drill bits cobalt. Cobalt drills are designed to cut through extremely hard metals including stainless steel. No center punch needed: Century 135 degree quick-cut points are self-centering and penetrate faster with less pressure will not walk or wander at the starting surface. Extremely heat resistant must be used and operated in power units that have a RPM speed of 1.500 or more for maximum efficiency. Aerospace NAS 907-J specifications. 12X life rating comparison to the average 118 degree point high speed steel drill.