with the experience for making tunsten carbide milling insert(40,48,411)type for20 years , our recommended ... grade for making tunsten carbide milling insert(40,48,411)type Chinese Grade Equal to ISODensity ... speed. Tolerance for (d).(l),and (s)of the milling blanks(30,38,311,40,48 and 411)and XTPUN,XSNUN ... .20 19.5-25.6±0.25 tungsten carbide milling insert(40,48,411)type