The swing-back tube mount trailer jack is painted with Zinc, which is corrosion resistant. The height is adjustable from 10-1/2" to 20-1/2". Fits trailer tongues 3" to 4" and helps easily raise and lower any trailer up-to a 1 ton (2,000 lb) capacity. Convenient wind handle delivers fast, smooth cranking. Includes a limited 1 year manufacturer warranty.