Square Boxes with Covers: Type - Square Outlet Box; Box Height in inch - 4; Box Width in inch - 4; Box Depth - in - 1-1/2; Capacity - cu-in - 21.0; Material - Steel; Knockouts/Sides-Bottom - (4)1/2"(6)1/2-3/4E - (2)1/2"(2)1/2-3/4E; Mounting Hardware - Bracket, Wrap Metal Stud, 2-1/2" - 3-5/8"