4-cutter hammer drill (4x90° symmetry), for use in concrete, masonry and natural stone, with SDS-plus holder or 2-groove locking, special main cutting geometry, centering tip for precise drilling, reduced friction and centric guidance in the drill hole, secondary cutting edges protect the drill when it hits reinforcement, large-volume 4-spiral conveyor spiral, shortened and conical spiral inlets for rapid removal of the drilling dust into the large-volume double spiral, maximum cost-effectiveness, exact, precisely fitting holes, maximum energy transfer, optimal vibration behavior, the strong spiral core optimizes low-vibration drilling behavior and extreme resistance to breakage, material: steel, hardness: 45 +/- 5 HRC, surface: gray, shot-blasted, rust-proof treated, pack of 1
