The Century Drill & Tool Shark Tooth Hole Saw Sets, Nos. 05905, 05906, and 05907, offers improved bi-metal hole saws. Each set includes hole saws and corresponding arbors, pilot drills, and/or adaptor nut. The Shark Tooth hole saws feature a 1-1/2" cutting depth, 8 percent cobalt high-speed steel teeth, and a variable pitch tooth pattern to cut through stainless steel, brass, aluminum, pipe steel, sheet metal, fiberglass, plastic, and wood. They can be used in portable electric drill machines, lathes, and milling machines. Each set comes in a heavy duty case with custom molded inserts to hold hole saws and accessories firmly in place.