Stainless steel curtain rings torsion spring clip on sunglass 1.Material:Stainless steel 2.Wire dia:1. ... .Usage:sunglasse About Products: Stainless steel curtain rings torsion spring clip on sunglass 1.Material :spring steel, stainless steel,zinc plating ... spring can be widely used in electronic toys, remote control, calculator, charger, cell phone, battery boxes, telephones and other industries.5 ...