Ideal for cutting plaster backed tiles, glass and ceramics. This drill bit features a spear-point carbide tip and a fluteless straight shank. Precision ground cutting angles ensure easy hole starting and reduced tile chipping. It is suitable for drilling ceramic tiles, mirrors, and glass. 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.