If you need to add a panel-mount connection for Ethernet without cutting custom hole shapes, the RJ-45 Ethernet Round Panel Mount Extension Cable is the easiest and fastest solution. Approximately 30mm in diameter, it allows for a simple drilled hole in wood, plastic, or metal using a common hole-saw or bit, with no special filing required.The cable comes with a plastic nut to securely mount the Ethernet jack on panels up to 16mm (0.625") thick, or as thin as a few millimeters. This robust adapter features a solid body and a forgiving plastic lip that neatly conceals the drilled hole, making it perfect for adding an Ethernet port to your project enclosure. Cable length (excluding connectors): about 23cm Panel mount Ethernet 8P socket with Ethernet 8P plug at cable end Straight-through extension cable Compatible with panels up to 16mm thickness Easy installation with common hole saw Includes links to detailed diagrams for reference.