| diameter of wire cores D/mm | diameter of mandril mm |
| D≤12.5 | 4±0.1 |
| 12.5＜D≤20 | 5±0.1 |
| 20＜D≤30 | 6±0.1 |
| 30＜D≤45 | 8±0.1 |
| 45＜D | 10±0.1 |
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