Keyboard Tray With Mouse Shelf Package includes: A. Keyboard Tray With Mouse Shelf, 1 pc B. #12-24 x sig" Pan Head, Pilot Point Machine Screw, 6 pcs “ Keyboard Tray With Mouse Shelf Features and Benefits: « Designed with steel construction, black powder coated, lightweight and sturdy, comes with a built-in mouse tray which can slide out.