DHS4BITCB Diablo 4 in Cobalt Pilot Drill Bit Drills hardened metals, cast iron, & stainless steel.Diablo’s high performance Cobalt Pilot Bit delivers faster cutting performance and increased productivity and is designed to fit all Snap-Lock Plus™ Mandrels for fast and efficient connectivity. This new Diablo Cobalt Pilot Bit provides the ultimate cutting performance in hardened metals, cast iron, and stainless steel for faster efficient cuts.Cuts hardened metals, cast iron, and stainless steel.Fits with Snap-Lock Plus mandrel system allowing a quick and easy change with no down time.Elevated performance in high heat applications.Ideal For: Drilling hardened metals, cast iron, & stainless steel.DIAMETER : 9/32 inLENGTH : 4 inSHANK : 1/4 in. hex