Neutrik Profi …. Spring loaded ground contact: retractable element with separate wedge contacts which keeps the shell in the front position when engaged thus also providing a direct and strictly coaxial electrical connection from the socket via the shell to the cable shield
https://www.neutrik.com/en/neutrik/products/phono-rca-connectors/profi-cable-connectors
https://audiokarma.org/forums/index.php?threads/rca-phono-plugs-neutrik-vs-wbt.675201/
https://www.neutrik.com/en/neutrik/products/phono-rca-connectors/profi-cable-connectors
https://audiokarma.org/forums/index.php?threads/rca-phono-plugs-neutrik-vs-wbt.675201/