Sure-Guides all-in-one drill system is a unique and innovative new design that combines simplicity and the latest technology for the stone and tile industry. Sure-Guide is a self-lubricating drill guide system that produces clean and accurate holes with ease every time. One of Sure-Guides greatest features is its ability to transform a multi-person project into a single-user task. Using Sure-Guides three inch suction ring, and one of four different size guides, anyone can drill a clean and precise hole every time. Sure-Guide Kit Includes: * One Sure-Guide 3" Suction Ring * Four Sure-Guide Guides: 1", 1-1/4", 1-3/8" and 1-1/2" * One Carrying case. The Sure-Guide Drilling System is very easy to use: just press the suction ring on the surface of stone, pure water in the ring, attach the guide of appropriate size, then drill the hole with ease.