... extruder 2.material:38CrMoAlA 3.Bimetallic layer screw and barrel for plastic extruder machine Screw material: 38CrMoAlA(JIS SACM645)Surface Treatment: Nitriding ... ,75mm,90mm,100mm,105mm,110mm,120mm,150mm,180mm,200mm screw and barrel for plastic extruder machine