The TomTom Rider 400 Anti-theft support is a locking system specifically designed to protect your TomTom Rider 400 GPS from theft. This bracket also solves the problem of the GPS coming loose when turned. The locking hole is specifically designed to fit the lock shown. This lock fits both TomTom Rider 400 and 450 models.
Should be used in combination with a Tomtom Rider 400 GPS lock, which you can find a recommended choice here.