To improve on the selectivity of the Drive-In Pallet Racks design, the Push Back Rack offers a dense storage layout but with the added benefit of gravity assisting in the automatic movement forward of products that are already in the same aisle. This is achieved by allowing for the pallets to rest on a cart that sits on a rail, which is sloped gently forward. New products deposited push back the existing pallets, thus, the name. Conversely, when the pallet at the end is removed, the next pallet automatically advances. Furthermore, we also install a speed adjuster separator between the first and second pallets in order to protect the products as much as possible.