O-Z/Gedney Type HBLG specification grade insulated grounding bushings are steel and malleable iron. These specification grade insulated bushings provide a grounding lug to allow for grounding of conduit through the insulated bushing. They help protect insulated conductors from abrasion during pulling or due to mechanical vibration and provide a voltage gradient between the live conductors and ground at the point where conductor insulation is subjected to electrical and mechanical stress.