For extremely hard porcelain tiles up to Mohs/Ritz hardness 9, as well as glass and porcelain, no cooling is required. This product is not suitable for percussion drilling and has no tapping difficulties. It features a center point for precise hole placement, a patented carbide insert, and a conically embedded cutting insert for increased breakage resistance. The increased stability and shortened neck reduce torsional forces, minimize springing and rattling, and enhance tool life. The unique anti-slip shaft prevents spinning in the drill chuck and ensures optimum torque transmission. This set includes a PROFI BETON drill bit to finish drilling in masonry after tile drilling.