Detailed Product Description CONICAL SCREW AND BARRELThe company specially produces screws and molten-rubber cylinders for homemade and imported 30-20000 gram plastic injection machines, 15-300mm single screw extruders, 30-130mm tapered and parallel double screw extruders, rubber machinery, petroleum machinery, etc. Using quality steel 38CrMoAlA, all products accord with the national standards ...