The pallet racking is used to store unitized pallet cargo, and is equipped with roadway stackers and other storage and transportation machinery. The high-rise shelves are mostly monolithic structures, which are generally welded by steel profiles (with pallets), connected by horizontal and vertical tie rods and beams. Pallet racks are the most widely used. They are used with forklifts and are free to pick up any cargo in any position. They are simple in structure, easy to operate and store, and safe. Heavy duty shelves can be used with different accessories, such as support bars, wire cages, steel plates, wood panels, steel mesh, etc. to meet different needs.