Route setters use two sizes of wrenches, 7/32 & 5/16. There are commonly two sizes of bolt. The smaller bolt is used on smaller holds and has a tapered head on the inner side. The larger size is flat. Holds with the larger size usually have a flat washer placed inset into the hold. Below are hex wrenches. Be sure to pick 7/32 & 5/16 for routesetting.