Optional RR21 rear mounting rails are available for additional support. Front-to-rear mounting rail supports have slotted cutouts to easily adjust rail depth and to provide open raceways for containing vertically run wire and cable.

The RX21 features the additional benefit of having the supports positioned 19" apart to accept standard panel width accessories mounted in vertical orientation. Cabinet is 30" deep and has a vertical panel space height of 36 7/8" It features one pair of recessed, hinged, and rubber-padded steel grips on each side (four total) for transport convenience.

Easy wiring access is provided through three wire isolation holes (two, 1 1/2" dia., and one oblong 1 1/2" x 3") in the rear base flange. The units' four, oversized, heavy-duty casters, two of which are locking, ensure smooth mobility, and have a load capacity of 175 lb. each - 700 lb. total weight capacity.