High speed steel (HSS) pilot bit drills wood, metal and plastics Spyder's Rapid Core Eject™ arbor removes cores without prying, cuts at an angle, and enlarges existing holes Spyder Hex10 pilot bit - 1/2-in hex, 1/4-in HSS drill bit Torque pins lock the hole saw in place - no tools are required to change out hole saws on the arbor 2-7/8-In drilling depth