If you need to add a panel-mount connection for Ethernet, but don't have the time or ability to cut a custom oval or square hole, this RJ-45 Ethernet Round Panel Mount Plug is the easiest and fastest way to panel-ify your existing Ethernet kit. It's about 30mm in diameter, so you can drill a hole in your wood, plastic or metal with a common hole-saw or bit, no special shapes or filing required. Un-screw the plastic nut, insert the plug and re-attach. Ta-da! Now you have two RJ45's on either side for connecting any cable.
It's designed to easily attach to a panel up to 16mm thick (or 0.625"), or as thin as a few mm. Perfect for adding an Ethernet port to your project enclosure! We like this plug in particular for its solid body and 'forgiving' plastic lip that hides the drill hole.