Stromberg Carlsons JB-246 Jack-In-A-Box 1500 lbs. Stabilizer Jack adjusts between 20" and 46" in length to fit the needs of your RV and campsite. The removable U-top fits most frames. The jacks feature an easy snap and lock adjustment and foldable handles for compact storage. All parts are powder coated or zinc-plated for corrosion resistance. Includes two jacks per carton.