This is a piece of original trunk panel, with a solid steel bar. Goodmark front panels don't line up with the factory groove. This works really good and it's fast. Picture number 2, open the vise about that much. Lay the flat bar in as far as you want the groove, and hit it pretty hard. Those Goodmark panels are pretty easy to groove. Picture number 3 shows the groove about 5-6 inches long.