2" X 3", 2 1/2" deep, 12.5" cubic capacity per gang, gangable. 1104-P Partition. For use with 1104 series device boxes. 4204-MSB Steel stud bracket and support. Concentric knockouts (4). 1/2" conduit knockouts (4). 1104-P partition. 4204-MSBU Steel stuid bracked and support. Concentric knockouts (4). 1/2" conduit knockouts (4). Universal cable clamps. 1104-P partition.