Thomas & Betts Insulated grounding bushing has a trade size of 2 Inch. It is made of malleable iron that is aluminum electroplated zinc and it improves ductility/provides strength. It is designed for use with rigid/IMC conduits. It measures 3.031 Inch x 0.770 Inch. It is designed to hold a wire of size 14-4 AWG. Insulated grounding bushing is UL listed.