SDS-Plus bits with solid compact head with 4 monoblock cross head in Tungsten Carbide and 4 independent spirals. The 4 coils and 4 single-piece molders allow you to distribute the puncture effort evenly over the entire length, compensate for the torsion force, ensure greater durability of the tip thanks to the less friction, obtain excellent evacuation of dust and rapid advance, a more powerful and resistant stroke, greater productivity and efficiency. Thanks to the optimum geometry of the 4 cutting edges, the tip will not block when it punches light armores. Strong penetration even in the toughest building materials. The 4 single-piece cross cutting edges encourage accurate drilling and ball holes. Suitable for drilling light armed concrete, concrete, masonry, hard building materials, brick, stone, portray, plaster. Suitable for all chucks and adapters with SDS-Plus attachment system