The TowSmart Dual Wheel Side Wind, Swing Down, Bolt-on Trailer Jack allows is ideal for boats and other marine and recreational applications. It easily mounts to your trailer tongue and securely locks into both raised and lowered positions with a spring loaded locking arm. Two durable, 6 In. solid molded wheels allow you to move the trailer in any direction. Zinc plated finish is thick and durable to withstand extreme weather. Folds away when traveling.