The push-back rack works by chart, the pallet on the cart can be pushed sliding on the guide rails, the pallet can push the pallet in the depth of the guide rail in storing, and taking the pallet out, the  pallet will slide forward to the pallet positions by gravity. It is with “First In, Last Out” principle. The storage capacity of push-back rack is similar with drive-in rack, but the forklift no need to go inside the racking, it offers higher working efficiency, but the depth of storage is relatively less.