Spyder Hex10 arbor and pilot bit assembly: 1/2-in hex, 1/4-in TCT drill bit, 5/8-18 thread Spyder's Rapid Core Eject arbor removes cores without prying, cuts at an angle, and enlarges existing holes Tungsten carbide tipped (TCT) pilot bit drills cement block, brick and other masonry materials 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 Always drill using a drill motor that is equipped with a support handle For use in standard rotary drilling mode Not for use in hammer or impacting drill modes Hex10 1/2-in arbor fits hole saw cups ranging in diameter from 1-1/4-in to 6-5/8-in