1. Hold measuring tape/ruler horizontally across the widest part of the natural nail. 

2. Use numbers below to find the corresponding nail fit

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18mm=0             12mm=5

16mm=1               11mm=6

15mm=2              10mm=7

14mm=3              9mm=8

13mm=4              8mm=9

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3. While ordering write down the numbers in the box provided. Make sure you include the numbers for both hands as the sizing can be different for each hand.