Square D individual meter sockets are power distribution panels used in single phase or 3 phase residential applications. These meter sockets are NEMA 3R enclosures that are supplied with ground lugs and top endwall hub opening. This requires the use of a bolt on hub or closing plate. This product is a ringless type with lever bypass, and overhead service feed. It also is rated at 320A with 7 jaws. Unit has 10,000 RMS Symmetrical Amperes short circuit current rating. A studs only option is available. They are UL Listed.