The Bridgeport 367-DC 2-1/2-Inch Zinc Die Cast Insulated Bushing used with a locknut to protect conductors inside threaded rigid or IMC when entering a box features a plastic metaliner that prevents damage to wire insulation. Temperature rated to 150 degrees Celsius, the bushing is 13/16 inches long, has diameters of 2-5/16 inches and 3-3/16 inches and is solidly built to meet construction and general industry OSHA-recognized, NRTL-listed electrical standards.