For drilling holes in many different materials, particularly porcelain, ceramics, glass, slate and marble. Should be used with water as a coolant. **Features** *Electroplated diamond particles enable the Addax diamond drill to cut through hard porcelain tile, glass, ceramics, marble and slate with ease.|*Hollow body facilitates core ejection on the smaller diameters, with slots on the wonder diameters.|*Anti-slip 3 flat shank on sizes 20mm and above.|*Diameter laser etched on body for ease of identification.|*Competitive price and high performance give lower costs per hole.|*Cooling system with guides available to order to aid use and extend life.