Spring Steel Strip for Roller Shutter Doors 1.Material: 65, 70, 75, 85, 65Mn, etc 2. ... .3mm-2.0mm 3.Width:30mm-355mm Specification of Spring Steel Strip for Roller Shutter Doors :1.Material: 65, 70, 75, 85, 65Mn, 55SiMnV ... without deforming.7.We can offer a sample for your testing.8.Application: Spring Steel is widely in the motor vehicle industry ...