... China, have specialized in the field of injection and extruder machine parts.Features of products 1. Highly Standard Modular DesignedThe ... are made of high strength cast iron. Gears and shaft gears are finished with gas carburizing process and precise grounding ... main Measurement:The Reference Pictures of Screw Barrel : Series double screw gear box for extruder machine(PVC, PP, PE, PA, PC, ABS . ...