... . The current carrying parts are of copper alloy. The round connector is designed to insure a positive electrical connection by ... No. Description Fix hub sizeSM-100-B1 Phase,100A,120/240Vac,4 jaw 1/2"SM-100-C1 Phase,100A ... ,120/240Vac,4 jaw 3/4"SM-100-D1 Phase,100A,120/240Vac,4 jaw 1" ... SM-100-E1 Phase,100A,120/240Vac,4 jaw 1-1/4" 100A Round Meter Base ...