| IDYL SIZE (US) | EU | UK/AUS | Ø DIAMETER |
|---|---|---|---|
| 3 | 44 | F | 14.1mm |
| 3.5 | 45.5 | G 1/2 | 14.5mm |
| 4 | 47 | H 1/2 | 14.9mm |
| 4.5 | 48 | I 1/2 | 15.3mm |
| 5 | 49 | J 1/2 | 15.7mm |
| 5.5 | 50.5 | L | 16.1mm |
| 6 | 52 | M | 16.5mm |
| 6.5 | 53 | N | 16.9mm |
| 7 | 54.5 | O | 17.3mm |
| 7.5 | 56 | P | 17.7mm |
| 8 | 57 | Q | 18.1mm |
| 8.5 | 58.5 | R | 18.5mm |
| 9 | 59.5 | S | 18.9mm |
| 9.5 | 61 | T | 19.4mm |
| 10 | 62 | T 1/2 | 19.8mm |
| 10.5 | 63.5 | U 1/2 | 20.2mm |
| 11 | 64.5 | V 1/2 | 20.6mm |
