... -219mm . Length:185~1400mm. Material: steel,iron,nylon,ceramic Shafts diameter:20~40mm packed in iron box Idler Roller,1.Idler Diameter ... :63.5-219mm2.Idler Length:185~1400mm3.Material: Iron,Steel,Rubber,Nylon,HDPE4.Shaft Diameter from 20 to 40mm Belt Conveyor ... Idler - tube material: iron,steel,rubber,HDPE- tube diameter: 63.5-219 mm - tube wall ...