Microgrit & ultra-fine grit size range from China GB9258-88 standard.
| MICROGRIT | ULTRA-FINE | |||
| Grit | Grit Size Range | Grit | Grit Size Range | |
| W63 | 63~50 | W3.5 | 3.5~2.5 | |
| W50 | 50~40 | W2.5 | 2.5~1.5 | |
| W40 | 40~28 | W1.5 | 1.5~1.0 | |
| W28 | 28~20 | W1 | 1.0~0.5 | |
| W20 | 20~14 | |||
| W14 | 14~10 | |||
| W10 | 10~7 | |||
| W7 | 7~5 | |||
| W5 | 5~3.5 | |||
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