These shelves mount to any industry standard 19" rack and give a professional appearance when mounting equipment. With 8" worth of depth available, this rack shelf can support equipment that does not normally mount to relay rack enclosures. The 1.75" mounting height means you do not use up valuable rack space. This light-duty shelf is constructed with black 16-gauge cold rolled steel and a small rear flange to prevent equipment from sliding off the back of the shelf.