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 from reinforcement hits, large-volume 4-spiral conveyor spiral, shortened and conical spiral inlets for rapid removal of 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 fracture resistance, material: steel, hardness: 45 +/- 5 HRC, surface: gray, shot-blasted, rust-proof treated, pack of 1
