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.