Heavy duty racks are one of the most commonly used shelves, with each layer bearing more than 500Kg. It has good picking efficiency and can store heavier items, but has a lower storage density. Heavy duty warehouse racks, also called pallet rack , have the characteristics of large bearing, wide adaptability, mechanical access, high selection efficiency, but the space utilization is general. Widely used in manufacturing, third-party logistics and distribution centers, etc.. It is suitable for a variety of small-volume items, but also for a small variety of large-volume items. Such shelves are most commonly used in high-bay warehouses and ultra-high-end warehouses (most of the shelves in automated warehouses use such shelves).