I purchased this set because I have a couple bad t-nuts, plus I wanted to set a heel hook on the side of the wall. Each of them is different. On the 15 degree wall, I set the biggest one upside down. Turn it into a very nice slope and at the same time can press from underneath, very interesting. The green one in the display picture, the dripstone feature is very curvy. You can easily find a spot for your whole thumb to press. I set this one as an undercling start point that there are several ways to grab it. On my 30 degree wall, I pick the relative juggy ones. Whenever I feel tired or unsure, I will grab one of them. Lesson learned from this purchase, I will always order hardware to save a trip to the home depot. Ignore me if you have a whole set sizes of screws.