Designed for commercial gym route setting, the Hedron Tech Feet are footholds that can't be used as handholds. They are directionally designed so you can adjust the difficulty. The most positive way is to stand on the crystals. Any other rotation and they become harder to stand on.
For a larger, more positive crystal to stand on, check out the 21 Hedrons.
Note on which bolts to use
We recommend you use flat head but we appreciate that many gyms are "socket cap only", so they are tooled to accept both.