Middle Atlantic ERK-1820LRD 18-Space Stand Alone Rack with Black Finish - 19 1/2 inches Deep18 SPACE (31 1 2), 19 1 2 DEEP STAND ALONE RACK LESS REAR DOOR, BLACK FINISH. Features: Fully welded construction, solid sides 2,500 lb. weight capacity UL Listed in the US and Canada Seismic certified (UBC 1997 & CBC 1998 Zone 4; IBC 2000, IBC 2003, ASCE 7 02, NFPA 5000 Seismic Use Group III) for protecting 650 lbs. of essential equipment when used in conjunction with our ERK Z4 brackets 1 2, 3 4, 1 and 1 1 2 electrical knockouts found 16 gauge steel