This product is ordered by lot. Purchase unit: 50 pieces. Uses precision molded grinding grains designed to be sharp. Grinding work is fast and easy. Increases productivity. Prevents burn. For grinding a wide range of stainless steel, ordinary steel, aluminum, etc. Width: 0.4 inches (10 mm). Grain Size (#): 80 mm. Length: 330 mm). Grinding Material: Precision molded grinding particle (ceramic).