It is also a shelf
RSF1111BK21 in the default 1U keyboard drawer configuration, it can support keyboard up to 1.25” in height and 16.28” in width. This configuration works with most of the compact low-profile keyboard with integrated trackball or touch pad mouse. In addition to the keyboard tray, RSF1111BK21 also comes with a fully functional mini shelf. The shelf features two oval cable access holes with plastic bushing cover for your VGA, HDMI, Display Port or USB Access cables. The shelf also has built in mounting holes for cable strap anchor brackets. This makes securing equipment on the shelf fast and easy.