American Meter Socket: 1.2mm Galvazined Steel 200A,240VAC American Meter Socket:1.2mm Galvazined SteelSquare 200A, 240VAC Single-Phase, 3 wires,4 terminalsc/w center earth lugRingless TypeExternal Hub Size: 1-1/2" optional American Type Meter Socket Model No. CE-200 4J-L