【Package】Include 4pcs 6mm Dry Diamond Drill Bits with Quick-fit Shank and 1pc 6mm Carbide Drill Bits. 【Size】Quick-fit Shank dry diamond drill bits: total length 65mm, diamond height 8mm.Carbide Drill Bit: total length 90mm, working depth 54mm. 【Machine】Compatible with most popular electric drills, angle grinders and bench drills, do not use impact or hammer mode.Generally hand drill in 2000-5000RPM, the faster the better, the slower then the shorter life span. 【Widely Use】 Dry Diamond Core Bit set is able to drill all types of tiles, porcelain, granite, ceramic, glass, marble. 【Good Performance】Quick-fit hex shank design for stable clamping, smooth and easy drilling, fast and smooth cutting, be more efficient and durable. EXFEIN Tile Drill Bits Kit 6mm 4pcs Quick-fit Shank& 6mm Carbide Drill Bits for Drilling Ceramic Porcelain Tile Marble Granite Masonry