Dutton-Lainson 6400 Swivel Trailer Jack This marine trailer jack is easy to install and swivels up, locking in place for convenient towing. The jack wheel has a 6 diameter and is constructed from heavy duty polypropylene to resist cold weather cracking. The side wind cushioned handle features an ergonomic handle grip with an extra heavy screw drive to help do the heavy lifting. This swivel trailer jack comes with all necessary bolt-on mounting hardware. Built to last this zinc plated jack featur