Description
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.
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