These fasteners are made in a wide variety of styles. The sizes of the most common type, made of bent wire, run from 00 (the smallest) to 5 and are the same in the United States and United Kingdom. The dimensions below, all in inches, come from measurements of examples and not from a standard.
| 00 | 0 | 1 | 2 | 3 | 4 | 5 | |
|---|---|---|---|---|---|---|---|
| A | 1/8 | 5/32 | 1/8 | 11/64 | 13/64 | 7/32 | 9/32 |
| B | 1/4 | 5/16 | 13/32 | 16/32 | 17/32 | 21/32 | 25/32 |
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Last revised: 1 February 2010.