Product Details: The Front-Pin Heavy Duty Square Jack from Buyers Products features a spring-return drop leg that allows easier expanding and retracting. The spring return is activated by pulling a sturdy front-mounted pin to drop the leg. The Square Jack is often used in pairs, connected to each other, for the heaviest duty lifting. Ideal for RVs, construction trailers and tri-axial trailers, the jack has a 10,000 lb (dynamic) and 12,000 lb (static) capacity. The 4 in. square tube features a weather-resistant black powder-coated finish, and includes a footpad. It can be ordered with or without a handle.