Lenox Speed Slot 2-1/2 In. Bi-Metal Hole Saw

M2 high-speed steel cutting edge welded to a shatter-resistant spring steel back. SPEED SLOT features a staircase designfor easy plug removal. 4/6 Vari-Tooth design for aggressive cutting action and reduced vibration. 3/16 thick heavy-duty backing plate is more durable than stamped backing cups and eliminates need for torque driving plate. Use for heavy-duty cutting in stainless and mild steel cast-iron copper brass aluminum plastics wood and composition board.;