The pull out keyboard tray by ESI has a 25" wide rectangular platform that can accommodate a keyboard and mouse.  It has an articulating arm on a glide track that mounts to the underside of a desktop and is fully adjustable to meet your needs.  It is height adjustable with 360º glide track rotation and has a +10º/-15º tilt adjustment for total customization.  Product guaranteed with a 15 year warranty on the platform and a 2 year warranty on the palm rests.