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12mm smooth cuts with perfect cutting result. Hole cutters use spring design which favorable to chip removal for superior drilling efficiency. This hole saw drill bit is made of high-speed steel, which has the characteristics of high hardness and wear resistance. High speed steel drill Bit is perfect for installing locks, knobs in doors and cabinets. High speed steel drill bit is used for bench drill, magnetic drill, stainless steel plate, square tube, iron, cast iron, wood and other general sheet metal.