Yes, right, every other round router bit you will ever buy will measure a radius. This will measure the diameter. The clock is fine. If you need a 1/2" radius. I needed a 1" radius so I bought this thinking it was what it was. It doesn't. The description specifically says it's the diameter but I'm so used to just going for the size make sure I don't even notice it don't make the same mistake I'm keeping it because there's nothing wrong with it except that it's not the size I need.
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