4 Professional Quality Tile & Glass Drills Use for Ceramic Tiles, Mirror and Glass Sized at 4mm, 6mm, 8mm and 10mm Once through the tile or mirror this drill bit will cope easily with any Masonry behind it. If using on Floor tiles, regularly lubricate the bit with water to keep it cool and working to its best Glass and tile drill bits provide smooth and accurate drilling in ceramic tiles, marble, china, mirrors and glass. Ideal for drilling fastener holes in bathroom tiles, or wall mirrors Spear pointed design reduces breakout. For use with drills that have a 3/8" or larger chucks.