... 2,material:iron/others 3,produce as your require 4,coating with Zn or 5,Max 4mm diameter All recliner spring ... plating, nickel plating, chrome plating, powder coating, e-coating, dip coating spring roll,spring loaded in,torsion wire spring,slinky spring,gas spring arm ... are available: polishing, zinc plating, nickel plating, chrome plating, powder coating Wire art Cheapest OEM/ODM recliner spring