... rolled once spiral blade,without welding 3.easy to installstainl screw stainless screw blade 35-800mm:1. Product DescriptionContinous cold rolled once ... to the combine havester,corn threshing machine,feed processing machinery,screw conveyer,cement mechanical equipment,industry and mining machinical equipment, planting ... (snow blower) and any other machines transmission devices . stainless screw blade