Switch-Device Outlet Box Extensions (Metallic): Type - Gangable; Material - Steel; Number of Gangs - 1; Box Height - in - 3; Box Width - in - 2; Box Depth - in - 2; Capacity - cu-in - 10.0; Knockouts/Sides-Ends-Bottom - None - (2)1/2" - None; Mounting Hardware - Plaster Ears