VERSITILE: Made from heavy gauge cold rolled steel, these 1U 4-Post Sliding Shelves were designed to hold 99 pounds and can be mounted to most any 4 post rack using the included mounting hardware CONVENIENT: Features venting for maximum airflow making this shelf the perfect addition to your rack. Common uses include holding and storing routers, cable modems, keyboards, or any other networking or AV equipment COMPATIBLE: These shelves take up 1 Rack Unit (1RU) and are compatible with any EIA Standard 19' server rack, bracket or cabinet. 2.1'H x 19'W x 17.7'D