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ASTM standard grinding equipment
product description:
An external ground joint with a suction or air guide on the top.
| 磨口 | 小咀外径（mm） | 单价 |
| 14/20 | 8 | 27 |
| 19/22 | 8 | 27 |
| 24/40 | 10 | 28 |
| 29/42 | 10 | 32 |