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ASTM standard grinding equipment
product description:
An internal grinding joint with suction or air guide nozzle at the top.
| 磨口 | 小咀外径（mm） | 单价 |
| 14/20 | 8 | 31 |
| 19/22 | 8 | 32 |
| 24/40 | 10 | 35 |
| 29/42 | 10 | 38 |