Glass and Tile Bit. It is made of high-speed steel and is suitable for drilling holes in glass, tile, and other hard materials. Features an exact start tip for clean holes and minimal bit walking in glass and ceramic tile. Engineered with sharpened carbide, Milwaukee glass and tile bits provide faster tile drilling than standard glass and tile bits. The reinforced carbide head provides increased durability when high-speed drilling into tile and glass. Use with drill-drivers only. Not recommended for use on porcelain tile.