SS316 substrate for enhanced corrosion resistance. Recessed Ring Design frame for better ring-to-frame bond. Single foot design with pre-ground foot for easier wrapping. Foot is arrow shaped to enhance thread-to-foot-to-blank holding capability. Smaller sizes help to reduce finished rod weight. Frame design raises ring slightly above blank for easier finishing. Batson & ALPS design effort. Plating: PVDTiCh. Ring Material: Zirconium.