Accurate, auto-centering drill guide in an easy-to-use design. Non-slip clamp prevents unwanted movement of drill guide during use. Prevents splintering of wood doors caused by blowout. Self-contained backset adjusters. Installs locksets and deadbolts on common interior and exterior wood, metal and fiberglass doors. Accommodates common backsets. The 10-piece kit includes an auto-centering drill guide, anti-splinter depth stop, 2-1/8" Ice-Hardened hole saw, 1" Ice Hardened hole saw, small thread arbor and PB, arbor adapter and spacer, two 3/32" drill bits, and (2) 1/8" drill bits for predrilling holes for latch plate screws. No. 49-22-4073: Pilot Drill Size: 1/8", 3/32", Material: Bi-Metal for Wood,Metal,Fiberglass Doors, Door Thickness: 1-3/8" to 1-3/4", Backset Size: 2-3/8" and 2-3/4", Pkg Qty: 1, Package Type: Clamshell