The recommended tile drill bit in opening holes in glass, it can enlarge existing holes with ease and can drill holes any arc of a circle. Cutting holes , no vibration phenomenon, easy to position, small resistance with higher operation speeds, easy to decorate and clean after drilling. Features - Color: Golden. - Material: Hard alloy. - Size: 7.00X0.50X0.50cm/2.75X0.20X0.20 inch. - Professional glass and tile drill bits provide smooth and accurate drilling in ceramic tiles, marble, mirrors and glass. - , making clean and accurate holes for you. - Industrial grade coated carbide point with 4 cutting edges. Can be installed in the hand drill, electric drill. - Suitable for ceramics, granite, tiles, stone, wood, plastic, concrete wall to drilling hole. - Once through the tile or mirror, this drill bit will cope easily with any masonry behind it. Package list: 10 x drill bits