EXTRA LARGE DESIGN: Large Surface 26.4” W x 11.8” D, TRAY weighing 10 lbs fits most keyboards and mice. NOTE: The total length from clamp to clamp is 31", so please make sure you have that much space on your desk before purchasing. STURDY C-CLAMPS : Use sturdy clamps fixed directly to your desktop, no need to punch the installation.The keyboard rest can be used on most tables that are less than 1.3 "thick. (Be sure to measure the thickness of your desk, and do not exceed 1.3") SAVES DESK SPACE : This under-desk keyboard tray expand more space for holding your keyboard, mouse, and other small accessories below the desktop, (Total tray weight is 10 pounds. Be sure your desk can support this under-mounted weight). ERGONOMIC SMOOTH GLIDING TRAY : Easily slide the tray in and out. When you need the extra space simply pull out the keyboard tray and start using it instantly. EASY TO ASSEMBLE : All necessary hardware and instructions are provided for assembly, you only need to fasten the clamp with 4 screws to complete the installation. This process takes only 2 minutes.