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, 65/132, 68/143, 70/135,70/140, 75/150, 80/143, 80/156, 92/188, 95/191, 105/191, 100/200The above are standard specifications ...