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. Your Super Duty truck rear doors are vulnerable too. Thieves will pry the handle away from the door just enough to get a piece of wire in to pull the rod. Installation is similar to changing the door handle, but once installed you gain protection from thieves prying into your vehicle. Use this kit on your rear doors, or if you are changing out your front handles with rear handles to get rid of the lock cylinder, put these plates in when you do that. With the lock removed, there are still other rods inside the doors that can be attacked unless they are protected. Models available for many popular trucks, SUVs and cars. Front door kits also available on Amazon. This kit fits rear passenger doors 1999-2016.