Square Boxes with Covers: Type - Square Outlet Box; Box Height in inch - 4; Box Width in inch - 4; Box Depth - in - 2-1/8; Capacity - cu-in - 30.0; Material - Steel; Knockouts/Sides-Bottom - (4)1" - (4)1/2"(2)3/4"; Mounting Hardware - Bracket, Wrap Metal Stud, 2-1/2" - 3-5/8"