... Diameter: 0.08~ 10.0mm 2) Type: Heavy duty torsion spring. 3) Main material: carbon spring steel ... used in automobiles, motorcycles, electrical appliances, telecommunication, craft, toys ,locks,stationery,furiture ,washing machines,vacuum cleaners,lamps and lanterns,bicycles,sports equipment ... ,etc12)packing: A. inner packing:polybag B. outer packing: Several polybag in one carton. Heavy duty ...