DeWalt DT60809-QZ

4-flute geometry. For clean, circular drill holes and consistently high drilling speed. Virtually eliminates jamming of the drill bit in reinforced concrete. Solid carbide head. For extremely long service life with optimum drilling performance, even in reinforced concrete (from 16 mm ø). Elongated helix. For optimised removal of drilling dust and faster drilling progress. 4-fold helix. Best possible drilling progress and extended service life of the drill head thanks to optimised removal of the drilling dust via four real helixes. Core reinforcement. For optimum impact energy transfer and fracture stability for maximum durability and reliability. Iron Blast TechnologyTM. By bombarding the surface with steel balls, stresses in the drill head are reduced and the strength along the flute is increased (from 16 mm ø).