The Milwaukee 4-Piece Tile and Natural Stone Drill Bit delivers up to 2x longer life in granite, stone, ceramic tile, and marble. Hammer mode capability provides faster drilling speeds when drilling natural stone tiles. Equipped with an aggressive 8-grind carbide head, these bits deliver up to 20% faster drilling. The bit's reinforced tip protects the carbide head, providing the durability needed for use in hammer drill mode. These Milwaukee natural stone bits can be used in drill-only mode or hammer drill-mode, and are not recommended for porcelain tile. Round shank. Set includes 1/8 In., 3/16 In., 1/4 In. and 5/16 In.