I had some large granite stones in the center of the yard that I wanted to move around and make a small wall out of. These springs and wedges were excellent for splitting stones. The key was making sure each was about 4-6 inches tall and the stones ripped as seen. Before I realized I had spaced them too far apart and a few tips broke from too much effort but I don't think it was a quality fault just an operator error, it worked like a charm every time!