Lenox speed slot bi-metal hole saw is ideal for heavy-duty cutting in stainless and mild steel, cast-iron, copper, brass, aluminum, plastics, wood and composition board. It is compatible with 5 length snap-back 1 length, 4 length or 5 length and standard K18 length arbor. It has 1 inch pipe tap and 3/4 inch pipe entrance. It features a staircase design for easy plug removal. Hole saw has enhanced tooth geometry and thin kerf design with advanced coating to make faster cuts. It exhibits 4/6 inch vari-tooth design for aggressive cutting action up to 1-5/8 inch deep. It has 3/16 inch thick heavy-duty backing plate for drive pins to minimize vibration and prevents damage due to high torque. A high-speed steel edge material is electron beam welded to fatigue resistant spring steel backing for increased performance. 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-metal1-1/8 in. diameterUse this hole saw with a 1L, 4L, 5L standard arbor or a 5L snap-back arbor.