Shanghai Tokin Co.,Ltd started the business at 2006,with many years experience in designing and making screw barrel,we can supply solutions for you in both injection moulding and extrusion screw barrel works.At present, we can do the work for screw barrels by Bimetallic,Chrome and Hardened treatment, which can be used for different polymer materials, you can please tell us about your polymers info and sizes or please send us your original drawings, we can design based on your different requests.