Threaded Ground Clamp, 1-1/4″ to 2″, Brass Screw with Copper Wire
https://nsiindustries.com/product/threaded-ground-clamp-1-1-4-to-2-brass-screw-with-copper-wire/
Use the Bridgeport 1-1/4″ to 2″ Brass Threaded Ground Clamp with Brass Screws to make connections with 4, 6, or 8 AWG copper ground wire through threaded rigid conduit.