Double deep rack series are derived from selective pallet rack, it is consist of two standard selective racks set up back to back. Simple structure and high storage capacity make it double inventory than ordinary rack type. These racks require special forklifts, and their specifications can be modified according to customer requirements. This rack system is widely used in tobacco, food and beverage, packaging and other industries. Accessories ? Frames Double deep pallet rack system has the same basic structure with selective pallet rack. The upright frames are composed of two columns, several horizontal bracing and several diagonal bracing. Usually double deep rack is consist of four frames together. ? Beams As a important role in rack, beam is the support part of the rack, it provides the storage space for cargoes, it may also be equipped with partitions, which may be steel plates or wire decks to use pallets to match different sizes. ? Pallet supports Pallet supports can provide added space for storage in needed if the size of cargoes is not suitable. Moreover, it makes cargoes more stable and safe, its length and width is determined by cargoes and racks. ? Row spacer Row spacer is used to connect each pallet rack bay, it saves space in aisles by connecting individual shelves together into a group, which makes racks more neat and unified. Notice The picking rate of selective pallet rack is 100%, which can achieve FIFO, while the utilization rate of space of double deep rack system is higher, but the picking rate is only 50%, so it is difficult to achieve FIFO. Selective pallet rack and double deep rack have their own advantages and disadvantages, and the specific choice of which one should be based on the size of the warehouse and the demand for cargoes.