Insulated Grounding Bushing, 1″, Malleable Iron with Lug
https://dev.nsiindustries.com/product/insulated-grounding-bushing-1-malleable-iron-with-lug-2/
Use the Bridgeport 1″ Threadless Malleable Iron Insulated Grounding Bushing to terminate threadless rigid or IMC conduit to a cabinet with a locknut that features a plastic metaliner to prevent damage to wire insulation.