Lenox Speed Slot 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. - Diameter: 2-1/4 In., Material: Bi-Metal, Cutting Depth: 1-5/8 In., Pkg Qty: 1, Package Type: Card Warning: Cancer -