Century Drill and Tool 05048 3-Inch Shark Hole Saw Eco Pack Shark Tooth hole saws are professional bi-metal saws with cobalt high speed steel teeth, electron welded to shatterproof, shock absorbing alloy bodies Century Drill & Tool 5048 3-inch Shark Hole saw Eco Pak Cuts up to 1- 1/2-inch deep holes. Hole saws are shipped without arbors Can be used in portable electric drill machines, lathes and milling machines