1,Round 2,Waterproof 3,Metallic 4,For meter GYB-100 Roung Meter Box ApplicationTemporary serviceOutdoor AdvertisingSmall customer serviceOther low amperage requirements SpecificationProduct NumberDescriptionFixed Hubs SizeGYB-100B1 Phase,100A,120/240Vac,4 jaw1/2”GYB-100C1 Phase,100A,120/240Vac,4 jaw3/4”GYB-100D1 Phase,100A,120/240Vac,4 jaw1”GYB-100E1 Phase,100A,120/240Vac,4 jaw1-1/4”