UNILETS Outlet Box, Number Of Outlet: 4, Material: Copperfree (4/10 Of 1 PCT Maximum) Aluminum, Size: 1 IN, Cable Entry: (4) 1 IN GRTX Hub, Cubic Capacity: 18 CU-IN, Knockouts: No, Cover Opening: 3.38 IN, Form Number: 1, Height: 3-3/4 IN