This 4-hole AMPS to 5mm screw adapter allows you to securely mount your Yaesu FTM-100, FTM-200, FTM-300, FTM-350, FTM-400, FTM-500, FTM-6000, or FT-891 radio to our EXT-01 extension plate or a vehicle-specific mount from brands like Proclip, Bracketron, Profit, or Panavise. With its sturdy construction and precise fit, this adapter ensures a reliable connection, keeping your radio firmly in place during use. Easily install and remove your radio as needed, while maintaining a sleek, professional appearance in your vehicle or workspace.