Steel spiral torsion spring 1. Material: steel 2. Type: spiral 3. style: torsion spring steel spiral torsion spring1. Processing machine: CNC spring ... by air, by express (DHL, FEDEX, UPS, TNT and so on)12. Customize: all kinds spring such as the ... automotive, appliance, machinery, toys, electronics, life products, jewelry and other industries. The company possesses more advanced processing equipment ...