Bosch 1/8" Natural Stone Tile Bit is designed with multiple cutting edges for harder tile materials. It delivers 20% faster drilling than glass & tile bit. The specialized carbide tip centers for no skate drilling & greater ease of use. The high quality carbide material provides longer life in hard materials. It is specially designed for natural stone tiles, slate, granite & other specialty tile materials that may be harder than normal tile. Not recommended for use on porcelain tiles. It is compatible with hammer drills.