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Octagon Outlet Box Covers: Application - General Ceiling Outlet; Shape - Octagon; Material - Steel; Box Diameter in inch - 4; Box Depth - in - 1-1/2; Capacity - cu-in - 15.0; Knockouts/Sides-Bottom - (4)1/2" (2)3/4" - (4)1/2" (2)3/4"