Bridgeport SGBS-39040 Split Grounding Bushing, 4 IN, Steel, Zinc Plated, 6-250 MCM, Bag of 1
https://nsiindustries.com/product/bridgeport-sgbs-39040-4-in-stel-splt-gnd-bsh6-250mcm-box-of-20/
Use the Bridgeport 4″ Mighty-Rite Steel 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.