I bought these to hang some very light crafts on the walls of my office. I have found that some stones fit well with these clamps while others are too small. Because the items I hang are so light and strong, I don't mind that the clips themselves are loosely attached to the bricks. I think in a pinch you can bend the pins a bit for a tighter fit. I think it is important to remember that bricks are not perfectly uniform when purchasing this product.
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