Idler Roller Idler Diameter:63-219mm . Idler Length:185~1400. Material:stell,iron,nylon,ceramic,rubber packed in iron box 1.Diameter:63 ... -219mm . 2.Length:190-3500mm . 3.Material: Iron, Rubber,Nylon, HDPE, etc. 4.shafts diameter from 20 to 40mm ... Belt Conveyor Idler - tube material: carbon steel pipe, rubber, HDPE or UHMWPE- tube diameter: 63-219 mm - tube wall ...