Tung Yung Steel Spring Bar Fty. Ltd has over 30 years experience, a well-known supplier and OEM manufacturer of clocks/watches parts as spring bar, screw, crown and any kinds of components as your necessary. Our factory specializes in producing stainless steel, titanium, brass items, semi-products, parts, etc., which are applied to jewelery, appliances, optical, stationary, fashion accessories, handbag and other consumable products.