High Quality Steel Spring 1.Top Quality Products 2.Pretty competitive price 3. ... are produced according to customer's design and requirementsMaterial: Carbon steel, Stainless steel , Brass, AluminumFinishing: Black, white and yellow zinc, black ... .Quality standard: ISO 9001:2008Established in 2004Work flow:High Quality Steel Spring Product profileScrews sort: Machine screws, Self tapping screws, Nylok ...