Octagon Outlet Box Covers: Application - General Ceiling Rework Outlet; Shape - Octagon; Material - Steel; Box Diameter in inch - 4; Box Depth - in - 1-1/2; Capacity - cu-in - 15.0; Knockouts/Sides-Bottom - None - (1)1/2"; Clamps - NM Cable; Mounting Hardware - Swing Arm, Side Cleats