... Extruder 5 setsl A, E Layer extruder screw and barrel(for PP and/or PE processing)l Diameter: 45mm×2 setsl Screw ... , precision grinded. (20CrMnTi alloy steel, which is the special material for reducer of heavy camion, surface through cementite processing and high ... precision grinding, with cycle oil lubrication system for outside, to extend using life).l Lubrication mode: force oil ...