- INTERCHANGEABLE CAVITY, COREPIN AND ?OTHER PARTS I INCORPORATED IN MOULD, ?FOR EASY REPLACEMENT OF PARTS.- WELL HEAT-TREATED PARTS SUCH AS?BUSHING, EJECTOR SLEEVE, COREPIN, ?ARDNESS UP TO HRC 55-58 BY VACUUM ?EAT TREATMENT.- REGULAR MAINTENANCE SERVICE IS PROVIDE ?TO ALL OVER WORLD