The Full Circle Trigon 180 Adapter Plate is for users who already own the center hub version of the Radius 360. Packaged with the Trigon 180 cast aluminum adapter plate and foam pad, this plate is ready to snap into the center hub of your Radius 360 sanding tool, instantly creating a corner and detail sander. The Trigon180 Adapter Plate can also be used with the Pro Handle Adapter creating a hand held corner tool.