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An 18 mm measurement is equivalent to approximately 0.71 inches. To visualize it, 18 mm is slightly larger than a US quarter, which has a diameter of about 24.26 mm. In terms of circumference, if you were to create a circle with a diameter of 18 mm, its circumference would be about 56.5 mm or 2.22 inches.

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3d ago

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Q: How big around is 18 mm?
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