Hydro-Handle Wet Diamond Drill Bit, 3/4" Bit 3/4" Drill Bit for tile, glass, stained glass, granite, marble, onyx, quartz and other hard ma Highly uniformed diamond bedding prevents chipping when working delicate materials. Designed for use with all 3/8" and 1/2" cordless drills as well as the HYDRO-HANDLE diamond drilling Water is required when drilling with HYDRO-HANDLE diamond drill bits.