Carbide Glass and Tile Bit Set (4-Pack)The Milwaukee 4 Piece Glass and Tile Drill Bit 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. These bits are designed with a reinforced carbide head for increased durability when high speed drilling into tile and glass. They're specifically designed for drilling holes in glass