The monitor/cantilever shelf for the APC NetShelter fits directly onto the front vertical mounting rails. The shelf occupies 2U of the cabinet height and has a depth of 15.75". It is ideal for networking applications and modem mounting. This shelf is painted to match the NetShelter and APC UPS. It ships with all hardware necessary for installation and only requires tools that ship with NetShelter, plus a screwdriver.