The Jimmi Jammer is a steel plate that mounts inside your vehicle door to prevent thieves from prying in around the handle to get at the lock rods. The Jimmi Jammer also helps prevent the lock from being punched into the door using a screwdriver. Installation is simalar to changing the door handle, but once installed you gain protection from theives prying into your vehicle. This kit is for 1999-2016 Super Duty F250 F350 F450 and all Excursions that have a lock cylinder on each front door handle. For maximum security, pair the Jimmi Jammer with either of our PunchPlug or LockCap products to protect the lock cylinder, also available on Amazon.