There are a lot of different things that you can use these rails for. They are nice, wide footholds. They are also really useful when combined with volumes, or protruding corners of a wall, both of which can make them into side pulls/handholds that are easier then their vertical V5 rating. Or, you can make them crazy difficult by putting them on inclines. The versatility is incredible. I've even used them with overhangs + volumes where they added a lip to a box-type volume. These holds really encourage creative uses.