Insulated Split Grounding Bushing, 4″, Zinc with Aluminum Lug
https://nsiindustries.com/product/insulated-split-grounding-bushing-4-zinc-with-aluminum-lug/
Use the Bridgeport 4″ Mighty-Rite Zinc Die Cast Insulated Split Grounding Bushing with Aluminum Lug to install bushings to 4″ rigid or IMC conduit or EMT fittings before or after wire pull-through.