Switch-Device Outlet Box Extensions (Nonmetallic): Type - Switch Outlet Box; Application - Airtight; Number of Gangs - 1; Depth in inch - 2.75; Width in inch - 2.25; Height in inch - 3.75; Capacity - cu-in - 18.0; Mounting Hardware - Bracket, Flange 1/2" Offset; Cable Entry - (4) Hinged Tabs; Material - Plastic; Device Mounting Holes - Standard