... conical twin screw barrel 2Material:alloy steel of high quality 3Processed to drawing or buyers request Alloy steel conical twin screw barrel for extruder ... after high temperatureScrew type:Gradual type, mutant type, wave type, barrier type, double screen type, shunt type, separation type, exhaust type, pin type, mixed type, double- head type, three-head type, multi head type etc ...