SYR-100A series round meter base 100Amps,120~240VAC, Single phase,4 terminal,2 or 3 wire,Fix hub size: ... 100 3/4"-1” 40 75X39X43CM•100Amps,120/240V AC,Single phase,4 terminals,2 or 3 wire Copper Jaw,Copper ... sealing ringFix hub size:1/2,3/4,1, meter socket