Use the Bridgeport 391 5-Inch Malleable Iron Insulated Grounding Bushing to terminate service conduit to a cabinet with a locknut. The bushing features a plastic metaliner that prevents damage to wire insulation and a 6 to 250 MCM lug for bonding a jumper to a neutral busbar. Temperature rated to 105 degrees Celsius, the bushing is 1-1/8 inches long with diameters of 4-13/16 inches and 6-1/8 inches, and is solidly built to meet construction and general industry OSHA-recognized, NRTL-listed electrical standards