round meter socket 100Amps,120-240V 1phase,4 terminal,2 or 3 wire, ... hub size:1/2"to 1-1/4" aluminum round meter socket1.100Amps,120/240V AC,Single phase,4 terminals,2 ... .The ground connector is designed to in sure a positive electrical connection by effectively clamping the conductor against a serrated surface ... ,1-1/4 for option Aluminum Die Casting 100A Round Meter Socket/Box