1U Vented Shelf 12In - 19" Compliant 1U 12" Deep Server Rack Cabinet Shelf For A Universal Fit In Any Eia/Eca-310 Server/Av Rack And Includes Mounting Hardware - Vented Rackmount Cantilever Tray Improves Airflow Around Devices On The Shelf And Within The Rack - The Durable Shelf Is Easy To Install, And It'S Constructed Of Durable 16 Awg Spcc Commercial Cold-Rolled Steel For Up To 55Lb - For Modems, Routers, Wi-Fi Access Points, And Other It/Network/Telco Equipment That Can'T Be Mounted Or To Store Tools/Supplies.