Steel Swivel: Designed with the finest craftsmanship and highest quality material from Mexico. Made from steel. This swivel is designed for a smoother ball bearing mechanism and an optimum swing for the speed bag. Easy to attach or remove speed bag. The ball bearing swivel is designed for longer durability and less weight. Mounting screws are not included. Recommended for home and gym use. Perfect to have a good workout without worrying about any problems.