Battery Contact with Spring 1.Surface:No burr, no scratch 2.Material:Stainless Steel ... :ISO&SGS 4.Tolerance:0.5mm Zinc-Plating Battery Contact with Spring:1 .abundant experience in mould and metal stamping parts .Stamping ... die casting. our scope of product : All kinds of cars, machinery, home appliance, electronic products, electric appliance, cameras, computers, power switches ...