Rigid Conduit Hub, Type Threaded, Throat Type Insulated, Trade Size 3-1/2 Inch, Size 4.81 Inch Dia x 1.75 Inch L, Constructional Feature Watertight, Ground Type Locknut Bonding Screw, Material Zinc Electroplated Dichromate Dip Malleable Iron Body, Zinc Plated Screw, Approval UL, CSA, Used On Rigid Conduit, Application Suitable for Service Entrance, General Purpose Fitting