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Black Oxide Industrial High Speed Steel drill bits are manufactured from industrial high speed steel, surface treated for high performance and long life. Designed to drill common steel, flat bar, angle iron, tubing, wood and plastic. 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. Black Oxide Industrial High Speed Steel drill bits offer 6 times Life Rating when compared to standard 118 Degree point drill bits.