I am using these on a 13 degree wall in a problem that includes the golfus crimps set #2 and #3. They are just right for setting in the v4/5 range at this angle with thin handholds. They are noticeably smaller than the proton steep wall feet, which I have on a 35 degree wall. I envision them working as a progression foothold when used to replace a proton steep wall foothold on the 35 degree wall.