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        Measure in millimeters.If you have a clothing tape measurer you can easily use it and bend it around the nail. *Do not try to convert Cm to Mm to get your sizes, it does not work.  
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        If you only have a solid ruler use this method.Measure on the widest part of each nail on both hands.  
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        Chart to convert your measurements.I drew on it to show which sizes usually go on each fingers . *but it’s still possible yours could be bigger/smaller.  
Option 2 - Order A Size Kit
Size kits include 1 nail of each size so you know exactly which ones fit you. No measuring necessary.