Shop name:Chong Qing Shuo Yue Ke Ji You Xian Gong Si Comprehensive and Compatible Tool Set - 5 Pcs Dry Diamond Core Drill Bits kit diameter of 1 or 4 inch(6mm)x2, 5 or 16inch (8mm), 3 or 8inch (10mm) and 1 or 2inch (12mm) Suitable for drilling holes. Advanced Dry Drilling Technology - each tile drill bits is equipped with an internal wax lubricant that melts during use to cool the cutting surface, 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 Suitable for drilling holes in porcelain, , ceramic, glass, marble, stone, and more.(not Suitable for wood). Universal 1 or 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 Suitable for both professional and DIY projects, this set ensures a long-lasting perSuitable formance even when drilling through the toughest materials like porcelain tile and glass. Material: steel colour: As shown Package Contents: 5 x 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. Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.