The HOLE DOZER? with Carbide Teeth Small Arbor w/ Cobalt Pilot Bit gives you up to 10X longer life than standard pilot bits. The Quad Edge tip decreases heat build-up while drilling, and a 135? split point allows for accurate and precise hole placement. Milwaukee's Hole Saw Cobalt Pilot Bit is designed for use in stainless steel, cast iron, wood, metal & abrasive materials. For best performance use with MILWAUKEE? HOLE DOZER? with Carbide Teeth Hole Saws.