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. Product Features:Designed for drilling in extremely hard materials including stainless steelCobalt drill bits have a great resistance to heat and friction providing a longer tool lifeCentury 135 degree Quick Cut Points are self-centering and penetrate faster with less pressureCobalt drill bits offer 12 times Life Rating when compared to standard 118 Degree point drill bitsMade in the USA
