The dual wheel swing-back bolt-on trailer jack is painted with Zinc, which is corrosion resistant. The height is adjustable from 11-3/4" to 24-3/4". Helps easily raise and lower any trailer up-to a 3/4 ton (1,500 lb) capacity. Equipped with (2) sturdy 6" wheels that provide low-friction mobility, allowing you to move your trailer into position easily. Convenient wind handle delivers fast, smooth cranking