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The size of your wrench refers to the size of the socket at the end. This is totally independent from the threading on the nut or bolt that you're screwing in. To make sure threading matches, you need to check the threading on the inside of the nut or bolt. To do this, measure the distance between 2 threads with a ruler or measuring tape. This can be kind of hard to do, so you may need to use a magnifying glass.

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