... ,Nickel Plating 3.Wire dia:from 0.01-3.0mm Remote control battery spring with double coil(Samples Welcomed ) 1.Material ... .All our products are made by high-quality steels and first-class producing processOur Advantage;1FactoryEstablished in 2000,got ... TreatmentPowder coating,neikel plating,chrome plating,zinc plating,etc and We can make according to your design7Production euipmentproduction line ...