High-performance drill bits for extremely hard stoneware tiles up to Mohs/Ritz hardness 9 as well as glass and porcelain. No cooling required. Spindle speed max. 600 rpm. (depending on diameter). No drilling difficulties. Using the centring tip for a precise hole. Patented carbide plate. Tapered embedded cutting plate for increased resistance to breakage. Precision, the red colour ring indicates the ideal drilling depth. Increased stability. Shortened neck reduces torsion forces, reduces spring/chattering and increases service life. Safety: Unique anti-slip shaft prevents spinning in the drill chuck and ensures optimal torque transmission. Not suitable for impact drilling.