Coupling and Bonding Connector, 1″, Brass for Rigid Conduit
https://nsiindustries.com/product/coupling-and-bonding-connector-1-brass-for-rigid-conduit/
The Bridgeport Mighty-Bond 1″ Brass Coupling and Bonding Connector with zinc die cast locknut and stainless steel set screw is for use with rigid conduit and securing grounding conductors at the enclosure.