Pushback Racks are basically selective racking that has been doubled into groups of four pallets. They increase storage density from 25%-65% while maintaining the flexibility to store a multiple SKUs (stock keeping units).
This type of dynamic system stores and retrieves pallets from the same aisle in a last-in, first-out (LIFO) order, reducing pick times. It is designed for operations that require a large number of full pallet pick faces with two or more pallets per SKU.
All of the pallets at each level, except the first one in, are placed on a set of trolleys that are pushed along rolling rails. These rails are built on a slight incline, lower at the front, so that the pallets at the back move forward when the pallet closest to the aisle is removed.