... ,gear,heater,screen changer system Matierials Screw element is made by W6Mo5Cr4V2 or 38CrMoAlA SpecificationsScrew element diameter from 10mm to300mmMatierials are W6Mo5Cr4V2 ... or 38CrMoAlAContain kneading block and conveying element If any questions,please feel free to contact us soon ...