The under-desk shelf for a keyboard & mouse is the perfect enhancement to an Alera Valencia series desk. Simply attach the four brackets under desk to keep your keyboard or mouse tucked away when not in use. Allows the desktop to be used as a writing or work surface while the keyboard & mouse are nestled underneath. 0.75" thick with sliding mechanism for sliding in & out. Series Name: Alera Valencia Series; Workstation Type: Straight; Sit-to-Stand Option: No; Keyboard Tray Dimensions (W x D): 28" x 12" x 0.75".