Plastic core thousand rounds Uses: Suitable for grinding a variety of irregular surfaces and ordinary plane, descaling and polishing. Widely used in automobile manufacturing, heavy machinery, shipbuilding, aluminum, stainless steel, metal and decoration industries, the metal industry bore polishing or grinding with good results. Features: direct use of high-temperature plastic molding once perfusion, increase safety and suitability specifications of hole. Specifications: diameter (2 '' 3 '' 4 '' 6 '' 8 '' 10 '' 12 '') X thickness (1 '' 2 '' 4 '') X aperture 13mm - 100mm particle number: A40 - A800 (Z36 - Z120 \ C40 - C600)