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Cobalt high speed steel drill bits are designed to cut through extremely hard metals, including stainless steel. No center punch needed. Century's 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 1500 or more for maximum efficiency. Cobalt high speed steel drill bits offer a 12 times Life Rating when compared to standard 118 degree point drill bits.