EXTRA LARGE SURFACE - The under-desk keyboard tray measuring 26.77" in length and 11.81" in width, fits a full-size keyboard and mouse, with extra room to spare for your phone, and other items. A large desk drawer adds valuable extra workspace to your office. THE CLAMP-ON TRAY - ETHU keyboard tray takes only 5 minutes to install, which is a compact, lightweight, scratch-resistant that can hold most keyboards and mice weighing up to 22 pounds. You won't have to worry about damaging your desk or spending time drilling holes in it because it can be easily mounted to desks up to 1.57 inches thick. MATERIAL- Keyboard Tray frame as well as the mount used to fasten the tray to your desk is made of solid Metal， Powder coating on the frame rust resistant design makes it more durable Wood is generally a popular choice for both aesthetic and durability purposes. SLIDING TRAY - The retractable smooth sliding rail design allows the desk drawer to glide smoothly forwards and backward. It encourages you to keep your arms and wrists in a neutral position and aids in the prevention of injuries caused by poor posture. Simply slide the tray under your desk when not in use and quickly pull it out when you need more space. ERGONOMIC BENEFITS -The Desk Clamp Keyboard Trays are designed to raise the keyboard and mouse to a more ergonomic height, reducing strain on the shoulder and neck muscles; eliminating potential pressure on the wrists; encouraging proper posture, and allowing for proper viewing distance. 1