This kind of grinding wheel is specially used and installed a special-used polish machine with high speed, high density and high hardness. It can polish stainless steel, bearing steel etc, special steel's billet, steel ingot, armor plate and steel tube's exterior lacuna. It has high grinding proportion and high efficiency. Users can choose the grinding wheels with different kinds of granularity, hardness, speed, organizing numbers and mixed abrasive scale according to the grinding grade of steel, polish machine's working load ect. Characters.