The frame reinforcement plate is 1/4″ steel and is laser cut. It has the holes for both the stock P/S box and the f-150 4×4 P/S box. The plate is designed to be welded to the outside of the frame. We include the 1/4″ wall tubes to replace the thin, stock frame braces inside the frame that collapse and allow the frame to collapse. To install the tubes you will need to grind them to fit your frame. The kit includes the frame plate, 3- 1/4″ wall tubes, 3 grade 8 bolts and 3 nyloc nuts. This product was originally designed by B.C.Broncos.