Precision engineered and rugged, all steel zinc plated construction for long life and trouble free operation. Features a wont Slip Off crank and free floating grip handle for easy, comfortable cranking. Extra strong 3-leg tripod with large foot pads minimize soft, sink-in problems. The tripod presents a compact package for easy storing. Each jack comes with a #1 bracket and hardware. Use 3 standard jacks for campers 1,500 lb. or less; 3 heavy-duty or 4 standard jacks for campers under 2,300 lb.; 4 heavy-duty jacks will handle the weight of any size camper.