HSS MATERIALS
| No. | Range D | |
| Metric | Regular sizes | |
| 8A | 6.25-7 | 6.3-7 |
| 7A | 7-7.75 | 7-8 |
| 6A | 7.75-8.5 | 8-8.75 |
| 5A | 8.5-9.25 | 8.70-9.50 |
| 4A | 9.25-10 | 9.50-10.25 |
| 3A | 10-10.75 | 10.25-11.00 |
| 2A | 10.75-11.75 | 11.00-12.00 |
| A | 11.75-12.75 | 12.00-13.50 |
| B | 12.75-13.75 | 13.50-15.00 |
| C | 13.75-15.25 | 15.00-16.50 |
| D | 15.25-17 | 16.50-18.25 |
| E | 17-19 | 18.25-19.75 |
| F | 19-21 | 19.75-21.50 |
| G | 21-23 | 21.50-23.75 |
| H | 23-26 | 23.75-27.00 |
| I | 26-29.5 | 27.00-30.00 |
| J | 29.5-33.5 | 30.00-34.00 |
| K | 33.5-38 | 34.00-38.75 |
| L | 38-44 | 38.75-46.00 |
| M | 44-54 | 46.00-56.00 |

| jackli1980@hotmail.com | |
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jack li |
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