Premium SDS-Max drill with a dynamic 4-cutter head (12-15mm Bits are 2-cutter). Symmetrical head-geometry with cutting-tip for optimised results in the event of reinforcement collision. Shortened spiral windings and conical shaped dust tracks for extra fast material removal into the high-volume double flute. The MAK4 significantly raises the performance parameters of drilling speed and life expectancy. This considerably reduces cost per hole.