If you need to add a panel-mount connection for DC power, but don't have the time or ability to cut a custom oval or square hole, this Round Panel Mount 5.5mm/2.1mm DC Barrel Jack Extension Cable is the easiest and fastest way to panel-ify your existing project. The outer flange is 30mm in diameter, and the threaded part is 23mm diameter, so you can drill a 1" hole in your wood, plastic or metal with a common hole-saw or bit. No special shapes or filing is required. Unscrew the plastic nut, insert the plug and re-attach. Ta-da!
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 DC power to your project enclosure! We like this plug in particular for its solid body and 'forgiving' plastic lip that hides the drill hole.
The cable is 30cm long (approximately 11.8 inches).