Rigid or IMC Conduit Set Screw Aluminum Entrance Cap 1″
https://nsiindustries.com/product/rigid-or-imc-conduit-set-screw-aluminum-entrance-cap-1/
The Bridgeport 1″ Rigid or IMC Conduit Set Screw Aluminum Entrance Cap serves as a connection point for service entrance wires. This threaded type entrance cap features two 7/16″ diameter holes or three 1/2″ diameter holes.