Titanium Coated Glass Drill Bits with 1/4" Hex Shank for Ceramic Tile Marble Mirror&Glass. If using on Floor tiles, regularly lubricate the bit with water to keep it cool, and working to its best. If using on Floor tiles, regularly lubricate the bit with water to keep it cool, and working to its best. Titanium coated for durable and longer life. Spear pointed design reduces breakout. Description ☆ Drill Drill Bits 6/8/mm with 1/4" Hex Shank for Ceramic Tile Marble Mirror &Glass. ☆ If using on Floor tiles, regularly lubricate the bit with water to keep it cool, and working to its best. ☆ Ideal for drilling fastner holes in bathroom tiles, or wall mirrors. ☆ Titanium coated for durable and longer life. ☆ Spear pointed design reduces breakout.