1-1/2 21 CU Inch Steel Outlet Box Extension Ring

Square Box Extension Ring; Brand Name Steel City; Type Outlet Box Extension Ring; Height 4 Inch; Width 4 Inch; Depth 1-1/2 Inch; Capacity 21 CU Inch; Number of Knockouts 6; Knockout Size (2) 1/2 Inch, (1) 3/4 Inch Conduit Sides, (2) 1/2 Inch, (1) 3/4 Inch Conduit End; Material Pre Galvanized Steel; Standard Package 50 Per Carton; Approval UL