The Demco 6335 Locking Plate allows the use of Lippert Pin Boxes with Demco Autoslide Hitches. Installation is easy; just slide the adapter base over the king pin and attach it with clamp plates. All required hardware is included.• Use on Lippert Rhino Pin Boxes• Designed for use with the Demco Auto Slide 13K, 18K, 21K Hitches Slide adapter base over king pin & attach it with clamp plates For use with Demco Auto Slide 13K, 18K, & 21K hitches | Demco Lippert Pin Box Adapter for Autoslide Hitches