100A Round Meter Base 1)Material: metal or copper 2)Size:1/ ... exterior. The current carrying parts are of copper alloy. The round connector is designed to insure a positive electrical connection by ... -100-B1 Phase,100A,120/240Vac,4 jaw 1/2"SM-100-C1 Phase,100A,120/240Vac,4 jaw 3/4 ... ,100A,120/240Vac,4 jaw 1"SM-100-E1 Phase,100A,120/240Vac,4 jaw 1-1/4" 100A Round Meter Base