DeWalt Hammer drill bit

4-Cutting Geometry - For clean, round drill holes and consistently high drilling speed. Nearly eliminates the risk of the drill getting stuck in reinforced concrete. Solid Carbide Head - For extremely long life with optimal drilling performance even in reinforced concrete (from 16mm diameter). Extended Helix Design - For optimized transport of drill cuttings and faster drilling progress. 4-Flute Design - Best possible drilling progress and extended tool life thanks to optimized removal of drill cuttings through four true flutes. Core Reinforcement - For optimal impact energy transfer and break stability, ensuring maximum durability and reliability. Iron Blast TechnologyTM - By bombarding the surface with steel balls, stresses in the drill head are reduced and strength along the flute is increased (from 16mm diameter).