Spyder 600646-10 Spyder 10-Pack Hex 10 1/4-In X 7-1/8-In Tungsten Carbide Tipped Steel Hole Saw Pilot BitSpyder 600646 10 Tungsten carbide tipped (TCT) pilot bit drills cement block, brick and other masonry materials 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 TCT 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 Always drill using a drill motor that is equipped with a