General description This diamond-coated core drill bit set is designed for creating clean and precise holes in various materials such as glass, tiles, marble, granite, and ceramics. The set includes 15 pieces with sizes ranging from 6mm to 50mm, making it versatile for different drilling needs. Technical specifications Material: Diamond-coated Sizes included: 6mm, 8mm, 10mm, 12mm, 14mm, 16mm, 18mm, 20mm, 22mm, 25mm, 28mm, 30mm, 35mm, 40mm, 50mm Installation Compatible with standard electric drills (not included) Usage Recommended to use lubrication (water) during drilling to prevent overheating Start drilling at a diagonal angle for best results Designed for making clean and accurate holes