grommet sizing used in North America
based on eyelet barrel inside diameter
| Size | Internal Diameter | ||
|---|---|---|---|
| 00000 | 1/16″ | 0.063″ | ≈1.59 mm |
| 0000 | 1/8″ | 0.125″ | ≈3.17 mm |
| 000 | 5/32″ | 0.156″ | ≈3.97 mm |
| 00 | 3/16″ | 0.188″ | ≈4.76 mm |
| 0 | 1/4″ | 0.250″ | ≈6.35 mm |
| 1 | 9/32″ | 0.281″ | ≈7.14 mm |
| 2 | 3/8″ | 0.375″ | ≈9.52 mm |
| 3 | 7/16″ | 0.438″ | ≈11.11 mm |
| 4 | 1/2″ | 0.500″ | ≈12.70 mm |
| 5 | 5/8″ | 0.625″ | ≈15.88 mm |
| 6 | 13/16″ | 0.813″ | ≈20.64 mm |