Mighty-Bond® Zinc Grounding Locknut with Aluminum Lug 3-1/2″
https://nsiindustries.com/product/mighty-bond-zinc-grounding-locknut-with-aluminum-lug-3-1-2/
The Bridgeport 3-1/2″ Zinc Die Cast Mighty-Bond® Grounding Locknut with Aluminum 14-4 Lug fastens threaded connectors or nipples to a box or enclosure. The 14-4 tin plated aluminum lug offers an additional bonding or grounding path.