Zhoushan Changjia Plastic machinery Co. , LTD is located in the middle of Jintang Island of the city of Zhoushan , As is a professional China Product manufacturers and Product factory , Company combines scientific research development , production and business operation and business property as a whole , our Product are based upon high quality steel 38CrMoALA , which is conditioned , surface nitridized (or coated with hard alloy) and polished , showing ver |