1.wire:0.5-20mm 2.Different shapes of hooks are available 3.ISO 9001,14001,TS 16949,13485 hook spring,auto spring,spiral spring,metal spring are all avaliable1.Steel 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 coating., Hook spring