... .reduce friction Increased using life mould parts with high quality core holder 1.core holder material:s45c+brass2 ... Stamps, Reference Inserts . Locating elements: Straight side interlocks, X-style Straight slide interlocks, Square interlock,Tapered interlocks, ... Air poppet valves . Cooling elements: Spiral plug baffles ,Straight plug baffles ,Threadless pressure plugs, Jiffy Connectors, Pipe plugs ...