Designed "Fan cup" diamond grinding cups to obtain the best performance in all the roughing works on concrete surfaces. The sintered segments are fixed to the high-performance steel body of the wheel by the laser welding technique, which is the strongest and most resistant. The specific design of the steel body and the perpendicular arrangement of the diamond segments facilitate the removal of the remains of the roughing material and increase the cooling of the diamond grinding cup. Allow the roughing of surfaces, and the grinding of edges in concrete. The degree of roughness left by these wheels is high and the working speed is higher than in a standard grinding cup, thanks to the double row of diamond segments.