swivel spring 1.Steel wire diameter from 0.5mm to 20mm 2.Environmental material 3.fast delivery time 4.free samples 1.swivel spring wire diameter from 0.5mm to 20mm2.Compression and No deformation 3.Good elasticity4.Applications: Automotive, medical device, electronics, toy etc.5.Surface treatment:Zinc,Nickel,silver,golden,tin,powder coating6.meet ISO9001:2000 swivel spring