The Articulating Keyboard Support, model 9041, is a keyboard support arm designed to provide keyboard access and position the keyboard to prevent repetitive strain injury. This unit mounts the keyboard beneath the desk, and allows the user to adjust its height and angle. The keyboard platform (not included) tilts plus or minus 15 degrees. The platform slides along a track mounted under the work surface and tucks away when not in use. OPTIONS: Large keyboard platform with left or right mouse tray; CPU holder (small, medium, or large). DIMENSIONS: Slide track is 21 inches long. The platform slides out 7 inches from the surface edge. COLOR: Black.