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 - (8)1/2"(4)3/4 - (4)1/2"(2)3/4"; Mounting Hardware - Bracket, Mount to Side of Stud