There are many types, such as CWD7050.CWB7500,CWE7050-7500 and so on. There are various of grade for different applications. Grades of Medium and Coarse Grain Size.GradeDensityT.R.SHardnessPerformance & application recommendedISOg/cm3MPαHRAYM614.9210090.0 Hard wood, original wood, aluminum section bar, brass rod and cast iron.K10YM814.7240089.5 Dry wood, soft wood, aluminum and brass, graphite ...