24u 30"D Server Enclosure with Solid Rear Door. The Middle Atlantic WRK-24SA-32 is a 24u server rack featuring a solid (rear only) door, 10-32 threaded rails, and a usable depth of 30.75 inches. The WRK series of racks incorporates a wider footprint for large cable bundles. This series is also seismic certified when adding Z4 brackets for additional stability.