Save Desk Space: This 33.8' x 11' ergonomic keyboard tray mounts under your desk, holding your keyboard, mouse, and other small accessories below the desktop for added workspace -Patent Pending- Swing Design for Comfortable Typing Angles: Move the tray forward or backward a total of 8.6' to find the most comfortable typing angle. Total swinging range is 165° and operates without the use of tools. Both height and extension adjust simultaneously