... twin screw and barrel for extruder. it's a special design for extruder, based on 38CrMoAlA, large output conical twin screw and barrel for plastic extruder Ruian Yumin machine screw ... co.,ltd is a factory specialized in making screw barrel, filter, ... .size: 35/75, 45/90, 45/100, 50/105, 55/110, 60/125, 80/143, 80/156, ...