Hammer Drill Special Direct System-max ZENTRO set the specific symmetric 4-cutter head design (a main cutting edge, two side edges) provides central guidance in the borehole, so round and straight holes. Minimised friction in the borehole ensures a long lifetime. Fast boring dust through the large-scale drilling dust of the double conveyor helix. Dynamic core reinforcement for energy transfer. The hammer drill penetrates quickly into the hard concrete by vibrating through the significantly reduced novel helical structure (core reinforcement), this allows for comfortable working for man and machine, the additional two minor cutting edges protect the drill when hitting iron reinforcement and help the drill head to prevent damage. Exact dimensional accuracy: trouble changing the drill with time. The hammer drill Special Direct System-max is the powerful tool for rotary hammers in the class about 5 kg, KVS-spiral, 12 15 mm 2-cutters from, 16 mm 4-cutters Usage: for concrete, masonry, natural stone. Packing: Individually in SB Packaging note: Pre-drill at least 150 mm deep when using drills with lengths over 450 mm