The Slick Rod Door Prop Rods from Carolina Custom Machine are great for holding your doors open at cars shows, etc. They prevent wind from blowing your doors and keep people off your running boards while enabling you to display your car's interior. One end slips over the striker bolt and "locks" in position. - the other end snaps into your latch jaws. For use on cars with rotary latches. Kit includes three collars to fit latches with 1/2", 9/16", and 11/16" striker size.