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The metal clasp side stays the same for both S/M and the M/L bands. So the three pieces are all you need to fit the correct size for your wrist.
Warren | Cincinnati, OH
Versa Lite, Ionic, Charge3, Inspire HR, Blaze(retired), Alta( retired),- Pixel 3
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It is correct the way it came. One piece stays on the watch; just switching the other piece changes size. That way, they can more easily include both sizes with just one extra piece.
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