Dry Vacuum Brazed Hexagon Shank Drill core bits for drilling tile ceramic granite marble Feature 1. Dry drilling without water feeding 2. Wide application for drilling tile ceramic granite marble stone.... 3. High diamond exposure rate provides a faster and more aggressive drilling. 4. Less Chipping, Minimizing breakage, less heat generation, Better finish quality 5. Vacuum Brazed technology provide much longer working life than electroplated ones (Generally 3-5times) 6. Save your money and time.... Specification: Diameter 44mm, diamond height: 10mm; Total length 80mm, Connection Hexagon Shank Package Included: 1pc piece 44mm drill bits ------------------------------------------------END--------------------------------------------------------- All the size: Diameter 16mm,18mm,20mm,22mm,25mm,30mm,32mm,35mm,44mm,68mm