Designed to fit easily onto the king pin box of the trailer. Makes installation, and removal, quick and easy. Lippert (long). King Pin Box Model #1621. 13-1/4" x 3-3/8" x 8-7/8"; Lippert (medium). King Pin Box Model #1116. 13-1/4" x 3-1/2" x 9-3/16"; and Lippert (long). King Pin Box Model #1716. 13-1/4" x 3-1/4" x 8-7/8".
