Together in warehousing, pallets are maintained by a system of beams and uprights called pallet racking. Pallet racking comes in a variety of configurations. Retail Display racks Supplier & Manufacture in India » . The most popular type of racking is adjustable (APR), while others include drive-in racking, push back racking, pallet mobile racking, palletized storage racking, narrow aisle ratcheting, and conventional racking.