... /plastic dies for speakers International design and quality complete machine equipments Dongguan Qiangyuhui Rubber & Plastic Product Factory1 Mould Base Standard : ... ,738H,718,8407,S136,NAK80,P20,KD-61,NIMAX ect ;3 Hardness of the steel : 20-60HRC ;4 Cavity Qty ... design and the manufacture of Plastic Injection Mould and tooling for Automotive, Electronic equipment,Medical Products, Double Color part ...