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 and ceramic tile with drill-drivers only. These drill bits are not recommended for use on porcelain tile. This drill bit set includes one 1/8 in., one 3/16 in., one 1/4 in. and one 5/16 in. glass and tile bits. The Milwaukee 4-Piece Tile and Natural Stone Drill Bit Set delivers up to 2X life in granite, stone, ceramic tile and glass. These bits are designed for use in hammer mode, providing faster drilling speeds when drilling into natural stone tiles, like granite and marble. Equipped with an aggressive 8-grind carbide head, these bits deliver up to 20% faster drilling.