Carbon Steel Coil Spring 1) Material: 62Si2MnA, 65Mn, SK3,SK4, SK5, SUS301,304 ... : 0.1-3.0mm 3) Width: 3-80mm Carbon Steel Coil Spring1) Material: 62Si2MnA, 65Mn, SK3,SK4, SK5, SUS301,3042) Thickness ... for Industrial machine,(ie. garden hose reels, balancer, Retractable Dog Leash, Ink Liner, Measuring Tape,meters and toys, cars safety belts ...