Dynamic drilling ability with secondary cutters protecting the drill bit in the event of reinforcement collision. The one-piece, solid carbide tip and patented reinforcing chamfering ensure low vibration and optimum drilling performance when drilling into reinforcing steel. Thanks to optimum 4 x 90° symmentry, all four carbide cutting edges function evenly and do not seize up on hitting reinforcing steel. Laterial support and maximum possible area of the interface between the carbide and steel body compensate for torsional forces. Centering tip for straight forward spot drilling with pinpoint accuracy. Four symmetrically functioning spiral ridges ensure low, uniform flute wear. Optimised flute core strength ensures low vibration drilling performance and exceptional fracture resistance. The high-volume flute geometry ensures the optimum removal of drilling dust. 4 Cutter head prevents seizing when drilling through reinforcing steel. Penetrates through steel deck plate eg Bondek® and concrete in one easy process.