bimetallic conical twin screw barrel for WPC profile production 1.Material:special alloy steel 2.Good customer service bimetallic conical twin screw barrel for WPC profile production specification:35/76, 45/90, 45/100, 50/105, 51/ ... 105, 55/110, 55/120,58/124, 60/125, 65/120, 65 ...