Diamond Drill Bit Built-In Coolant Mist Injecting System Tilebit is a new diamond tool used to drill holes in all types of tile, including the hardest floor and porcelain tiles that previously have been difficult or impossible to drill, says the maker. Tilebit offers a unique built-in method of injecting a coolant mist to the face of the tool. This feature allows a high rotational speed that results in high penetration rates in drilling all non-metallic, hard vitreous materials. Bit sizes are from 3�16 in. to 3 in. dia, suitable for 3�8-in. variable high-speed corded or cordless drills or drill presses at 1,800 to 3,000 rpm. Barrett Diamond Products Inc.; 800/243-3320; www.Tilebit.com