88398 - Rack Mount Swivel Keyboard Shelf Mounts into a slope or vertical rack 22-5/8" to 30"D (575-762mm). Keyboard tray swivels allowing the use of any standard size keyboard up to 21"W (534mm). Removable platform provided for mouse pad. Tray size: 21"W x 15"D (534 x 381mm). Shelf and tray use 3-1/2" (2U) of rack space. Black. 88398 Shipping weight 20 pounds.