If you need to add a panel-mount connection for USB C, but don't have the time or tools to cut a custom oval or square hole, this USB C plug to USB Printer B socket Round Panel Mount Cable is the easiest and fastest way to panel-ify your project. 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 a USB C plug to USB B socket adapter!