... installation 3.reduce friction Increased using life mould parts with high quality core holder 1.core holder material:s45c+brass2.has angle ... interlocks, Square interlock,Tapered interlocks, Taper pin sets . Ejector devices: Two-stage ejector, Accelerated knock-outs,slide core units, Lifter . Ejector ... , South Korea, etc. Our Brands: Since 2002, we had created two brands - Datong Precision and Cumsi