Buyers Products 12 Inch Heavy-Duty Side Pin 4 Inch Square Jack with Handle Model 0091410HBuyers Products 12 Inch Heavy Duty Side Pin 4 Inch Square Jack with Handle 0091410H The Side 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 side mounted pin to drop the leg. Ideal for RVs, construction trailers and triaxial trailers, each jack has a 10,000 lb (dynamic) and 12,000 lb (static) capacity. The 4 in. square tube