Packing(pieces/box): 100 Diameter/Height: 22/1 Max R. P. M: 10000 Granularity grades: 1-Coarse; 2-Mid-Coarse; 3-Fine Following series instruments are specially designed for workspieces, used for various alloy tooth/alloy frames/alloy base plates grinding polishing, also used for tooth crown & connecting points of the alloy workpieces fine finishing and polishing. Please choose the shape and granularity grades of the instruments according to the work requ Warning: Please use our products as the instructional speed. We are not responsible for the damage caused by wrong operation.