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I would like to ask how the specification of the air eye are indicated, for example, what size air eye does 300# represent?
The specification of the air eye is expressed as: XX#. For example: a 300# air eye is usually 5mm in inner diameter, 9mm in outer diameter, and 4mm in height.

Metal air eyes are categorized by style: regular air eyes, flat air eyes, wide-rimmed air eyes, wrap-around air eyes, and oval air eyes.

Metal eyelets are categorized according to specifications: 80#, 100#, 150#, 250#, 300#, 350#, 400#, 500#, 600#, etc.

Metal eyelets, accessories, also known as metal eyelets, hollow rivets, shoe eyes. The material is generally made of copper, occasionally see plastic products, used for clothing accessories, mostly used in casual clothing equipped with drawstrings for the export of hats, can also be used directly as a decoration for the surface of the garment.