Diamond finishing stone for precise edge tuning and polishing. The unique design enhances the the efficiency of cutting and polishing in both directions ensuring the perfect edge. The Diaflex moonflex file should be used lubricated. A domestic spraybottle with 50% water and 50% denaturated alcohol is recommended without too much pressure being exerted. White = 600grit Fine. Yellow = 400grit Medium. Red = 200grit Course.