Footholds need not be very big...these 15 holds are extra small in size but offer lots of purchase for your toes on the steepest of walls.
The utilization of countersunk bolts allows some of the holds in this set to be have a lower than usual profile, forcing you to be more accurate than usual with your footwork.
You have the option of purchasing a 7/32" Ergo Wrench to tighten these bolts. As pictured below.
This set requires 15 x 1.5" countersunk bolts.