Libra New 1000 lbs Bolt on Boat Marine Trailer Jack w/Swivel Wheel & Wheel Stopper 1000 lbs lift capacity, 10" lift travel, 2" outer tube, 6" swivel caster wheel, 13" retracted height, 23" extended height, 11" clearance height, Bolt on, side mount, swing away, fit trailer tongue up to 3.7"5x4.24" Zinc plated suitable for marine application, Mounting hardware included as shown in picture Heavy duty plastic wheel stopper included, Large diameter donut shape prevents sinking and keeps trailer in place