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.