We , Ningbo Tianze Machinery Technology Co.,Ltd , over 26 years experience in this line , having drawings for Haitian Injection Molding Machines and most of drawings for Chen HsongOur main products is Screw & Barrel :The Screw & Barrel for Injection MachineThe Screw & Barrel for Single-Screw Extrude MachineThe Conical Twin-Screws & Barrel for Extrude MachineThe Parallel Twin-Screws & Barrel for Extrude MachineFor more details, pls find kaylee(at)tizatech.com