Adjustable Slide-out Keyboard Tray This ergonomic keyboard tray is height adjustable, 360 horizontally rotated/swiveling and 43 vertically tilted to your required position, pull it backward or forward. Note: The adjustable keyboard tray gravity self-locking setting prevents accidental pushing and pulling, and can be pushed and pulled smoothly by gently lifting it. Compatible with Different Types of Desk Due to its special mechanical design, this keyboard under desk pull out tray also fits desks with beams. The under desk keyboard tray is compatible with desktops made of wood, MDF, or other materials with similar characteristics (plastic, stone, glass, etc., are not compatible). NOTE: Please make sure your desktop thickness is at least 0.71 inches. Larger with Plenty of Space The keyboard shelf size of 28.3 x 10.2 with smooth carbon fiber texture provides plenty of room for your keyboard and mouse.