| SIZE |
MM DIAMETER |
| A | 11.95 |
| A ½ | 12.18 |
| B | 12.37 |
| B ½ | 12.60 |
| C | 12.78 |
| C ½ | 13.00 |
| D | 13.21 |
| D ½ | 13.41 |
| E | 13.61 |
| E ½ | 13.83 |
| F | 14.05 |
| F ½ | 14.15 |
| G | 14.36 |
| G ½ | 14.56 |
| H | 14.65 |
| H ½ | 14.86 |
| I | 15.04 |
| I ½ | 15.27 |
| J | 15.40 |
| J ½ | 15.70 |
| K | 15.80 |
| K ½ | 16.00 |
| L | 16.10 |
| L ½ | 16.41 |
| M | 16.51 |
| M ½ | 16.71 |
| N | 16.92 |
| N ½ | 17.13 |
| O | 17.35 |
| O ½ | 17.45 |
| P | 17.75 |
| P ½ | 17.97 |
| Q | 18.19 |
| Q ½ | 18.35 |
| R | 18.61 |
| R ½ | 18.80 |
| S | 19.10 |
| S ½ | 19.31 |
| T | 19.51 |
| T ½ | 19.84 |
| U | 20.02 |
| U ½ | 20.20 |
| V | 20.32 |
| V ½ | 20.68 |
| W | 20.76 |
| W ½ | 20.94 |
| X | 21.18 |
| X ½ | 21.30 |
| Y | 21.49 |
| Y ½ | 21.69 |
| Z | 21.89 |
| Z ½ | 22.10 |