Conduit Hardware, Bushings, Insulating, Trade Size: 3 1/2 Inch, Material: Malleable Iron, Connection Type: Threaded, Maximum Temperature Rating: 150 Degree C, Features: For Rigid and IMC, With Bronze Lug, Outside Diameter: 4 1/2 Inch, Width: 1 Inch, Grounding Wire Size Minimum: 14 AWG