Preamer 5pcs Titanium Coated Glass Drill Bits Set 3/4/6/8/10mm with Hex Shank for Ceramic Tile Marble Mirror Glass Titanium Coated Glass Drill Bits Set 3/4/6/8/10mm with Hex Shank for Ceramic Tile Marble Mirror&Glass Use for Ceramic Tiles, Mirror and Glass Once through the tile or mirror this drill bit will cope easily with any Masonry behind it Ideal for drilling fastner holes in bathroom tiles, or wall mirrors Titanium coated for durable and longer life Spear pointed design reduces breakout For use with drills that have a 3/8" or larger chucks.