Insulated metallic grounding bushings are for use with accompanying aluminum lay-in grounding lug to terminate conduit service; recommended for applications with copper or aluminum bare ground connectors. Protective thermoplastic throat liners are rated to 105 ° C and help prevent wire insulation damage. Built to last high grade malleable iron construction; trade sizes from 1/2” to 6” available and always in stock. All models UL listed.