Double tooth design strengthens each tooth for longer life and improved durability. High-speed steel cutting edge welded to alloy steel body. Thick, hardened backing plates prevent thread stripping. Cuts material up to 1-3/4" deep. Will cut through a 2x4. Use for cutting in aluminum, brass, bronze, copper, plastic, stainless steel, wood, and other compositions. Use DeWalt mandrel model nos. as indicated.