With dry stone walls, the bricks /stones are 'dry', that is, stacked without damp mortar. They are then interlocked with friction in the composite. There are older natural stones or industrially produced cubes of concrete blocks. For freestanding walls, the bricks are nowadays often on site fixed with a bonding mortar together, then the wall becomes more stable.
Natural stones in drywall can be strongly weathered and already torn. They are then only suitable for wall mounts, please see for yourself why, before installing climbing aid check the bearing capacity of the rock!
There are five construction styles with the standard brackets can be used, the heavy kit but only with fairly large stones and massive kits only in very large blocks. In principle, therefore, material thickness is key, for attachment of brackets in stones of a dry stone wall are only suitable at a certain thickness. Weaker cable systems such as 'lightweight design' can also be used with smaller stones. In case of doubt, before adhering holders first fix several stones together by mortar pressed into the stone joints to a larger stone block; it is called cementing.
By strong unevenness in the stone wall, use places which protrude outward for the wall brackets, to achieve a sufficiently “large” distance off the wall. Due to the unevenness, some spots are unfit for fastening holders. To assure stability you may need more wall mounts then intended.