Spyder Hex8 arbor and pilot bit assembly - 3/8-in hex, 1/4-in HSS drill bit, 1/2-20 thread Spyder's Rapid Core Eject™ arbor removes cores without prying, cuts at an angle, and enlarges existing holes High speed steel (HSS) pilot bit drills wood, metal and plastics Spin on, spin off saw mounting 2-7/8-In drilling depth