How to Measure non-manchu Rings

 

Measure the thumb's accurate circumference at the first joint below the finger tip.

微信图片_20180418154241
微信图片_20180418154241

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微信图片_20180418154245

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微信图片_20180418154253

微信图片_20180418154241
微信图片_20180418154241

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To use: turn 90 degrees to lock