The Bridgeport 367 2-1/2-Inch Zinc Electroplated Malleable Iron Insulated Bushing can terminate threaded rigid or IMC to a box using a simple locknut. It features a plastic metaliner that prevents damage to wire insulation. Temperature rated to 150 degrees Celsius, this bushing is 13/16 inches long, has diameters of 2-5/16 inches and 3-1/8 inches and is solidly built to meet construction and general industry OSHA-recognized, NRTL-listed electrical standards.