... keychain, leather keychain,pu keychain,promotional leather keychain,pu keychain,car keychain1. Material:zinc-alloy(Available aluminum alloy, brass and iron ... machines ,3 sets of 3-D die carving machines , 2 set of electric discharge machines , 2 sets of grinding machines ,3 ... sets of milling machines ,1 set of lathe ,etc .2): molding machines: 3 sets of zinc ...