Pallet rack, also referred to as “pallet racking” is a material handling storage aid system designed to store materials on pallets (or “skids”). Although there are many varieties of pallet rack, all types allow for the storage of palletized materials in horizontal rows with multiple levels. All types of pallet rack create some level of increase storage density with the least dense being the least expensive and cost increasing with storage denisity. Selective rack is the least dense position up to gravity flow racking. Forklift trucks are usually an integral part of any pallet rack system as they are usually required to place the loaded pallets onto the racks for storage. Pallet racks are an essential and ubiquitous element in most modern warehouses, manufacturing facilities, retail centers, and other storage and distribution facilities.