Comprehensive & Compatible Tool Set - 10 Pcs Dry Diamond Core Drill Bits kit size of 3/16 inch(5mm), to precisely tackle a wide range of drilling tasks. These bits make precision work on materials a breeze. Advanced Dry Drilling Technology - each tile drill bits is equipped with an internal wax lubricant that melts during use to cool the cutting , preserving the integrity of the diamonds and extending the life of your bits. Precise Drilling - Achieve holes with the vacuum brazed diamond technology that ensures a clean and precise cut every time. Perfect for drilling holes in porcelain, , ceramic, glass, marble, stone, and more.(not for wood). Universal 1/4 inch Hex Shank - Compatible with the most electric drills, angle grinders, and bench drills. Quick change is facilitated by the hex shank, improving efficiency and reducing downtime between drill bit changes. Enhanced Durability - Dry diamond drill bits set featuring a robust design that resists wear and tear. perfect for both professional and DIY projects, this set ensures a long-lasting performance even when drilling through the toughest materials like porcelain tile and glass. Colour:Black Material:Metal Package Contents: 1set * core drill Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.