1,OEM/ODM spring clip,steel sheet 2,diffrent surface treatment 3,Coating with Zn ... sheet/metal spring/spring clip or compression coil spring can be customized. spring roll,spring loaded in,torsion wire spring,slinky spring,gas spring arm,spring plunger,spring hose,diaphragm spring clutch ... plating, chrome plating, powder coatingo stainess steel wire OEM/ODM spring clip compression coil ...