These things are very small! I can't fault them as they give measurements but as someone who rarely uses the metric system I didn't really realize how small the 10mm diameter was. They are just over 1/4 inch in diameter. What I blame them for is how fragile/fragile they are. The one in the photo was split in half, that's how it came out of the box. I broke another one by driving the screw through the hole a bit too far. The magnet strength is decent for its size, but again this size is tiny so you won't be hanging very heavy things with these little fellas.
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