UNILETS CPU Universal Outlet Box With Hub Cover, Number Of Outlet: 4, Material: Malleable Iron, Size: 1/2 - 3/4 IN, Cable Entry: (4) 1/2 - 3/4 IN Hub, Cubic Capacity: 21 CU-IN, Knockouts: No, Cover Opening: 3.81 IN, Fixture Stem Size: 3/