Rigid Conduit Insulated Bushing, Type Threaded Male, Trade Size 4 Inch, Diameter 5-1/8 Inch, Throat Type Thermoset Phenolic Insulated, Temperature Rating 150 Deg C, Material Thermoset Phenolic, Approval UL, CSA, Used On Rigid Conduit/IMC, Bushing Hole Diameter 3-7/8 Inch, Locknut Thread Length 5/8 Inch, Includes Locknut