Cutting geometry for clean, circular drill holes and consistently high drilling speed. Practically impossible for the drill bit to get stuck in reinforced concrete. Solid carbide head for extremely long service life with optimum drilling performance, even in reinforced concrete (from 16 mm diameter). Extended helix for optimised drill dust removal and faster drilling progress. Four spirals ensure the best possible drilling progress and extend the service life of the drill head thanks to optimised removal of drilling dust. Core reinforcement ensures optimum impact energy transfer and fracture stability for maximum durability and reliability. Iron Blast Technology reduces stresses in the drill head and increases strength along the flute by bombarding the surface with steel balls (from 16 mm diameter).