Century Drill & Tool 7/16 in. X 5-1/2 in. L Cobalt Drill Bit Straight Shank 1 pc

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.