The Patriot Docks 4-foot End Rail is a truss-style support that spans the full width of each dock frame section. Measuring 4 feet wide by 12 inches tall, this aluminum end rail provides critical structural reinforcement and is required to complete or connect frame sections. When do you need an extra end rail? Each 8-foot Patriot Docks frame section includes two end rails-one on each end. When connecting multiple sections, the end rail from the next section is shared. However, an additional 4 FT end rail is required to cap off the final section at the lake end of your dock. This end rail is made from marine-grade aluminum and is compatible with all Patriot Docks Truss Frames.