Switch-Device Outlet Box Extensions (Metallic): Type - Nongangable; Material - Steel; Number of Gangs - 1; Box Height - in - 3; Box Width - in - 2; Box Depth - in - 2-1/2; Capacity - cu-in - 12.5; Clamps - NM Cable; Mounting Hardware - Bracket, Wrap Metal Stud, 2-1/2" - 3-5/8"