Lenox Speed Slot bi-metal hole saw features a staircase design for easy plug removal. It cuts up to 1-5/8 inch deep. It has a sleek slit, enhanced tooth geometry and advanced coating for efficient cutting process. Hole saw has 3 inch diameter. It fits 2L/6L snap-back arbor and 2L/3L/6L/7L standard arbor. It has a pipe entrance of 2-1/2 inch. Hole saw is ideal to cut mild steel, copper, brass, aluminum, wood, plastic, composition board and cast-iron. Hole sawReinforced to cut stronger, last longer and resist tooth strippageThick backing plate with holes for drive pins resists damage due to high torqueHigh speed steel teeth resist breaking and offer extended lifeBi-metal3 in. diameterUse this hole saw with a 2L, 3L, 6L, 7L standard arbor or a 2L, 6L snap-back arbor.