Includes all the goodies you need to rack 'em up: Entire 20U open frame rack structure, 4x leveling feet, 1x 1U vented shelf (15.12" deep), 1x 2U vented shelf (18" deep), and 25x rack mounting screws. Is it Christmas in here or is that just me? Open design and included vented shelves optimize air flow, keeping even today's hottest, high-end networking and AV components cool.