torsion spring 1.Advanced equipment 2.Good after-service 3.quick delivery,ISO9001, 14001 ROHS 4.free sample high quality torsion springMaterial:stainless ... steel,carbon steel,alloy steel Applications: Automotive, medical device, electronics,toy and so onThis spring will ... time: within 7 days delivery time: 15-20 days torsion spring in hardware