Dutton-Lainson 6820 Rigid Marine Trailer Jack w Drop Leg This marine trailer jack is easy to install and is perfect for boat and other trailering applications. The zinc plated foot helps provide stability when not in use. By pulling the lynch pin you can quickly adjust the length of the heavy duty drop leg. The side wind cushioned handle features an ergonomic handle grip with an extra heavy screw drive to help do the heavy lifting. This rigid trailer jack comes with all necessary bolt-on mountin