Picked these for warm up and endurance circuits on an arch with angles from 35deg to horizontal. I think the overview description given for this product is pretty spot on. Up to about 60deg they lend themselves to V0-V1. In a roof the double incut its not super deep so they are not exactly monkey bars. It's a bonus that the texture is a little nicer on the hands than many of the other holds I've gotten out of the box. I would say you can even squeeze two hands onto two of the holds in a roof.