This kit comes with (6) 36" long hat sections that can be welded under the floor or on top of the floor to strengthen it for mounting the seats or just to give your floor a little more support where it is needed. The hat sections are 2" wide and have a 3/4" rise with a 3/4" flange for welding. You also get (6) 5" x 24" of flat sheet metal. They are all made from 16 gauge cold rolled steel for a good and strong easy-to-weld kit.