
Square Box Extension Ring; Type Square Box Extension Ring; Height 4-11/16 Inch; Width 4-11/16 Inch; Depth 1-1/2 Inch; Capacity 29.5 Cubic Inch; Number of Knockouts 12; Knockout Size (8) 1/2 Inch Conduit Sides, (4) 3/4 Inch Conduit Sides; Material Drawn Steel; Standard Package 25; Approval UL; Application Commercial, Fire Alarm