The Surface Mount Dryer Receptacle is 3-Pole, 3-Wire, 30A-125/250V NEMA 10-30R – Non Grounding. The receptacle is easy to wire and the lay-in terminals accept up to #4 AWG copper or aluminum conductors. The receptacle will fit a single or 2-gang outlet box and use a wallplate with 2.147 in. diameter hole. All mounting hardware is included.