1.Dia:12-350mm 2. one of the four biggest manufactur 3.special material engineer 4.Prompt reply H13 1.Main applicationFull hardness(HRC52-54)plastic moulds with high polishing and long service life requirements, such as Bakelite plastic moulds, Tin,lead,Zn and Al alloy die casting mould(such as engine radiator, lights and other decoration products), Aluminum extruded moulds(such as Aluminum ...