Eaton / Cutler Hammer Ring 3-wire single position meter socket with a voltage and current rating of 600 V/125 A measuring 8 Inch x 3.500 Inch x 10.880 Inch has over head service type. 4-Jaw surface mount socket has 8 - 2/0 AWG copper/aluminum line/load side terminal and 3-5/16 Inch hub opening. 1-Phase socket is ideal for residential applications. It is UL listed and meets NEMA 3R certification.