A central tungsten carbide plaque that offers optimal performance. A newly conceived centerer with fluid transition to the propeller guarantees immediate perforation and easy centering. The plaque is characterized by three so -called "breaking points" that allow a better transmission of the impact power from the machine to the worked material. The rupture points generate micro cracks in the perforated material, thus increasing the perforation speed significantly. After breaking the concrete, debris or perforation powder must be transported outside the hole. Thanks to the variable width propeller, the narrower front gives a high debris transport capacity. In addition to avoiding explosions of dust or speed reductions caused by obstructed holes, the propeller also reduces friction in the hol.
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