These Auto CAD designed, laser cut, stainless steel adapter plates make it a breeze to install high end Focal 5 1/4" midrange drivers into your doors. Simply unbolt the OEM midrange, bolt in the adapter plate, then bolt the new midrange driver to the plate. Absolutely no cutting or drilling required. Stainless fasteners are tig welded to the inside of the plates, making installation a snap. Fasteners included. See the Videos section for a complete installation tutorial.