E-Z Lock® Snap-in AC/MC Connector Duplex 3/4″, Die Cast Zinc
https://testing.nsiindustries.com/product/e-z-lock-snap-in-ac-mc-connector-duplex-3-4-die-cast-zinc/
Use Bridgeport snap-in connectors to make fast, high-quality connections between AC/MC cable or flexible metal conduit and a box knockout. To install, just snap the connector into the knockout for a reliable connection – no tools required.