Bridgeport 686-DCX2 2 IN Dcx Mc Connector, Box of 2
https://nsiindustries.us.com/product/two-screw-strap-type-mc-connector-2-die-cast-zinc-rectangular/
Use Bridgeport two screw strap type connectors to connect interlocked metal clad cable to an electrical box or enclosure. This connector comes with a rectangular throat, providing a positive end stop for the inserted cable jacket.