Dry drilling without water feeding, 6mm-12mm bits with Wax inside helps cooling the bits? Wide application for drilling tile ceramic granite marble stone.... Vacuum Brazed technology provide much longer working life than electroplated ones (Generally 3-5times)? Less Chipping, Minimizing breakage, less heat generation, Better finish quality? High diamond exposure rate provides a faster and more aggressive drilling.Application: Used for opening holes in marble, ceramic tiles, granite, pebbles, walls and other materials. This item is in the category "Home, Furniture & DIY\DIY Tools & Workshop Equipment\Power Tool & Air Tool Accessories\Drill Bits". The seller is "vearter" and is located in this country: CN. This item can be shipped worldwide.