Steel enclosure Single phase, 2 spaces, 4 circuits, 2 tandem breakers accepted, 120/240 volt 10,000 AIR No PK3GTA-1 ground bar sold separately Slot/square drive screws, 3 ground bar mounting locations Straight in main design Tangential main service knockouts Use No.10 maximum wire size for GFI circuit breaker No.12 - 3 A1 or No.14 - 4 Cu AWG main wire Style 1 box - 4.81 in. x 9.30 in. x 3.19 in. UL Listed