This 5th Wheel Hardware Kit is an auxiliary kit for installing 5th Wheel rails and brackets. (It is used with the CURT Universal 5th Wheel Base Rail.) Corrosion Resistant. This fifth wheel hardware is coated with a rust-resistant zinc coating for long-term protection against rain, snow, mud, road salt, etc. Make the life of the auxiliary kit grow. After a long period of use, you will notice that the screws and nuts on the fifth wheel trailer hitch begin to rust and crack, resulting in an unstable connection and causing a safety hazard. Simply replace this 5th wheel assist kit with a perfect match to the universal rails to restore an enjoyable driving experience.