Required to mount our Trucourse™ Rudder to kayaks with pre-tapped mounting holes with screw inserts found on the stern of the kayak (includes Wilderness System, Necky, Ocean Kayak, Emotion, and more). Great for mounting the Sea-Lect Designs Trucourse Rudder to most kayaks/boats with pre-tapped rudder mounting holes with screw inserts found on the stern of the kayak (includes Wilderness System, Necky, Ocean Kayak and more).Stamped 304 Stainless SteelFits: Wilderness System, Necky, Ocean Kayak and moreFeel free to contact us for questions if this will fit your kayak. Please include Manufacturer, Model and Year with your inquiry.