on Metal, about 1 inch in diameter · c/whatisthisthing · 3 pts · 2yI think I found the screw plug. https://www.phoenixcontact.com/en-us/products/plug-for-cable-screw-gland-hc-bs-pg16-1674516
I think I found the screw plug.
https://www.phoenixcontact.com/en-us/products/plug-for-cable-screw-gland-hc-bs-pg16-1674516