Precision engineered and rugged, all steel zinc plated construction for long life and trouble free operation. Features a will not slip off crank and free floating grip handle for easy, comfortable cranking. Extra strong 3 leg tripod with large area pads minimize soft, sink in problems. The tripod presents a compact package for easy storing. Each jack in set comes with a 1 pound bracket and hardware. Use 3 standard jacks for campers 1500 pounds or less, 3 heavy duties or 4 standards for campers under 2300 pounds, 4 heavy duty jacks will handle the weight of any size camper. HEAVY DUTY SET OF 4