Bosch 4-Pack Natural Stone Tile Bit Set is a professional-grade solution for drilling through hard tile materials. These bits are designed with multiple cutting edges for faster drilling and longer life. The specialized carbide tip centers for no-skate drilling and greater ease of use. The high-quality carbide material provides longer life in hard materials. The 3-flat shank offers outstanding bit grip to avoid slippage. These bits are engineered for use in natural stone tile, slate, granite, and other specialty tile materials that may be harder than normal tile. Not recommended for use on porcelain tiles. Compatible with hammer drills.