In order for the legs to remain vertical when the ramp slopes up or down, the folding brace that attaches to the side of the frame must be able to be attached at different spots. This is provided for by a series of holes in one of the grooves of the main frame rather than just the single hole usually provided for bolting brace to frame. The owner simply chooses the hole that works. The rest of the holes are neatly covered up by an aluminum piece that slides within the groove. This provision is standard for ramp sections but it can also be ordered for our regular sections so you can slope up or down from a Shore Mount or a Fascia Mount. Ramps simply have no hook hardware on their shore-end.