DIY Custom Design - Save desk space by transforming your own keyboard tray into an under-desk pull-out drawer with this keyboard mount. Package includes 2 slide rails. Height Adjustable for Ergonomic Typing - This keyboard mount allows you to easily slide your tray in and out from under your desk and enjoy ergonomic typing angles that relieve stress on your wrists and shoulders. The rails are made of solid steel for a stable installation that lasts! Rotatable Design - Increase your desk space by transforming your own boards with this under-desk keyboard mount! The C-clamp can rotate 45 degrees, accommodating irregular desk thicknesses up to 4cm (please measure your board size before purchasing) for a variety of L-shaped corner desks. Easy Installation - It comes with all the necessary hardware, and it's easy to mount your keyboard tray to your desk with the keyboard mount, supporting up to 18kg.