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 5L snap-back 1L, 4L or 5L and standard K18L 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.