Minimum inside diameter is approximately 27 mm (1.06 inches) from side to side and a tiny bit less vertically. The walls are 1mm thick to reduce cost in stainless steel materials but are thick enough to keep the model sturdy yet slightly springy in plastic options.
This design is appropriate for use with thinner napkins. It is best to fold your napkins prior to purchase in order to determine the proper sizes that best suit your needs.
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