Century Drill & Tool 05072 Bi-Metal Hole Saw, 4-3/4"

German Made professional bi-metal saws with 8% cobalt high speed steel teeth, electron welded to shatterproof, shock absorbing alloy bodies. Variable pitch tooth pattern cuts clean through stainless steel, brass, aluminum, pipe steel, nail embedded wood, hardwood, plywood, sheet metal, fiberglass and plastic. Suggested speed: 70 RPM for cutting mild steel. Decrease 30% for cast iron. Increase 30% for brass/aluminum. Hole saws are shipped without arbors and pilot drills, order separately. Can be used in portable electric drill machines, lathes and milling machines.