Description: Dekton Brazed Diamond Hole Drill Tile Porcelain Marble Bit 5/5.5/6/7mm Sizes Available: - 5.0mm - 5.5mm - 6mm - 7mm Features: - Wax core design provides self-cooling and self-lubrication. - Diamond drill bit for dry cutting ceramic, porcelain (Grade 5) and stone. - 1/4 inches hex shank to prevent slipping and for use with corded / cordless drills. - Manufactured from high grade hardened steel. - For best results use at 1500-2800rpm.