14 inch, 3/4 Extension Keyboard Tray Slides, Black. Create your own custom keyboard tray with these all metal, ball bearing keyboard slides. Mounts under your desk to your platform. Six position height adjustment from 2" to 3-3/4". In and Out locking detent to hold keyboard in the out or the in position. If youre looking for a keyboard slide for a custom desk, or you are replacing a worn out keyboard slide on an old desk, this one is easy to install, and has flexibility in the mounting height.