... 4.various grit Diamond needle filesTechnology:diamond grit was absorbed to the surface of matrix(C45). Feature:wear-resisting,sand and ... to 60,it is not easy broken edge with a high speed. (3)Overglaze color,underglaze color,underglaze blue,wall brick,floor tile ... ,sanitaryware,ceramics,silicate product silicon pellet.grit size from 60 to 80. (4)Other metal ...