Centre point. For a precise, pinpoint start. Two additional cutting edges flank the central carbide chisel plate for very smooth running and constant drill hole geometry with the best driving performance. In addition, deeply embedded carbide elements with high-temperature copper brazing guarantee maximum break-out resistance. Four-channel helix. Best possible drilling progress thanks to simultaneous discharge of the drilling dust via four large helix channels. Specially machined shank end For maximum impact energy throughput.