Smart fixed shelves, also known as stacking racks, have unified specifications, fixed capacity, clear storage of goods at a glance, and are easy to inventory in the warehouse. The shelves can be stacked high on each other, achieving three-dimensional storage and easily forming the ability of three-dimensional storage without the need for equipment such as shelves.. Suitable for areas such as rental warehouses, low and old-fashioned warehouses, or temporary storage areas in workshops that are not suitable for investment warehouses