... spring wire from 0.5mm to 15mm 2.finish:anti-rust oil ,zinc,nickel,silver,tin 3.Usage:auto,motorcycle,industry 1.spring ... , hardware spring,cylinder spring, mechanical spring,mechanical spring reel,spring drive mechanism are all ... ,golden,tin,powder coating.4.material:65Mn5.Usage:auto,motorcycle,industry,ariculture,mine,furniture,elevator and so ...