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We r a professional manufacturer of screw barrel ,injection molding machine screw barrel , extruder machine screw barrel, rubber processing machine screw barrel, twin conical screw barrel, twin parallel screw barrel, high wearing resistant screw barrel ,bimetallic screw barrel ,screw barrel assembly parts.If u have any interest and inquiry for our items pls contact me directly,my email is export at jinyiscrew dot com, msn is challychen at hotmail dot com .