... 4.various grit Diamond needle filesTechnology:diamond grit was absorbed to the surface of matrix(C45). Feature:wear-resisting,sand and ... Ni,and it keeps good finishment.The working sexction finishment is based on the grit size.The more fine ,the better surface.Usually used 150#, ... ,sanitaryware,ceramics,silicate product silicon pellet.grit size from 60 to 80. (4)Other metal products ,such as aluminium , ...