They seem to be well made except that they fall a little short of what is required to get a secure lock in a trapezoidal stone. I know it's not a wall slab because I've tried other keystones in the slab and they fit well. However, a little ingenuity solved the problem. I was able to get them to snap into place very securely by pushing the clip with a large toothpick and then cutting the toothpick. Now they are so hard I would have to pull out a toothpick to get them out. In general I am satisfied, but I am only satisfied that I was able to solve the problem of non-compliance with the specifications.
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