Sliding Keyboard Shelf for 16" Keyboards - 19" Rack-Mountable 19" Rack Mountable 2.25"H x 19"W x 12"D Compatible with 16 inch wide or less keyboards. Adjustable Mounting Depth: 12" to 28" Mounts on 2 or 4 post racks. (extension rails included) Requires 2U of space on 19" Rackmount for mouse tray clearance.