Shark Tooth® hole saws are professional bi-metal saws with 8% cobalt high speed steel teeth, electron welded to shatterproof, shock absorbing alloy bodies. Shark Tooth’s® variable pitch tooth pattern cuts clean through stainless steel, brass, aluminum, pipe steel, nail embedded wood, hardwood, plywood, sheet metal, fiberglass, and plastic. Can be used in portable electric drill machines, lathes and milling machines. Set includes: 3/4″, 7/8″, 1-1/8″, 1-3/8″, 1-1/2″, 1-3/4″, 2″, 2-1/8″, 2-1/2″ Shark Tooth® hole saws, and two arbors with pilot drills.