... 3.reduce friction Increased using life mould parts with high quality core holder 1.core holder material:s45c+brass2.has ... a specialized manufacturer of mold components in DIN, AISI, JIS Standard in China. Established in 2002, Datong Precision had been certified ... Square interlock,Tapered interlocks, Taper pin sets . Ejector devices: Two-stage ejector, Accelerated knock-outs,slide core units, Lifter . ...