Bosch Natural Stone Tile Bits are designed for decorative specialty tiles that feature natural stone and other harder materials. The bits provide multigrind heads with multiple edges and high-quality, specialized carbide tips that center for no-skate drilling. Bosch Natural Stone Tile Bits are designed to deliver 20 percent faster drilling in natural stone tile and other hard tile than standard glass and tile bits. The larger diameter bits provide a three-flat shank for superior bit grip. These bits were engineered for use in natural stone tile, slate, granite and other specialty tile materials that may be harder than normal tile (though they are not recommended for use on porcelain tiles).