Insulated Grounding Conduit Bushing Material: Malleable Iron With Aluminum Lug Size: 1/2" to 4" Insulated Grounding Bushing Our products involves Electrical Metalic Tubing,EMT Connector,Coupling,Intermediate Metal Conduit,IMC Coupling,Conduit Bushing,Conduit Body,Conduit Straps,Junction Boxes,BS Conduit and fittings,Strut Channel Hanging System. Q1-11/2" malleable ironQ2-23/4" malleable ironQ3-31 ...