Ideal for cutting plaster backed tiles, glass and ceramics. Spear-point carbide tip and a fluteless straight shank. Precision ground cutting angles ensure easy hole starting and reduced tile chipping. The bit must always be used on low speed with coolant and, if you're using a percussion or impact drill, turn off the hammer action.* Suitable for drilling ceramic tiles, mirrors and glass* Spade-shaped carbide tip with fluteless straight shank* Precision ground cutting angles for easy hole starting* Reduced tile chipping for a professional job* Always use on low speed with coolant (water)* Not suitable for use on toughened glass* For use in 10mm and 13mm capacity three-jaw chucks* Must not be used on hammer action