Spring Steel Strip for Roller Shutter Doors 1.Material: 65, 70, 75, 85, ... 3.Width:30mm-355mm Specification of Spring Steel Strip for Roller Shutter Doors :1.Material: 65, 70, 75, 85 ... without deforming.7.We can offer a sample for your testing.8.Application: Spring Steel is widely ... and many general engineering applications. It is suitable for applications that require high strength and toughness. Typical ...