PP,PE,PVC,PET,ABS,PPR for Plastic Extruder Machine Conical Twin Screw and Barrel material: bimetallic layer PP, ... PE,PVC,PET,ABS,PPR for Plastic Extruder Machine Conical Twin Screw and Barrel Zhejiang Bohai Conical twin screw ... by film in woodenNitride Brittleness≤Grade OnePayment TermT/T , L/C ,Western UnionSurface RoughnessRa0.4umDelivery Term20-30 working daysScrew Straightness0 ...