The WRS-4 12 1/8" D X 29" H wall mount rack by Middle Atlantic. Body and back pan are constructed of 18-gauge steel, rack rail is 11-gauge steel with threaded 10-32 holes in universal spacing and accommodate 4 usable rack spaces. Mounting brackets are 14-gauge steel, hinged top is 16-gauge steel, hinged top and center section are locking and separately keyed. This rack is phosphate pre-treated and finished in a durable black powder coat and has a capacity rating for 150 lbs. Electrical knockouts in the back accommodate 1/2" and 1-1/2" conduit, laser knockouts on the back accommodate larger cable bundles. The rack is fully welded construction. WRS Series racks are UL Listed in the US and Canada. WRS Series are GREENGUARD Indoor Air Quality Certified for children and schools.