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The safety clamps are designed for coupling and uncoupling in oil natural gas drilling operation. It can prevent the drill tools form slipping down. When changing the working range, it is only necessary to adjust the No. of chain links.
| Type | Pipe O.D | No. of Chain Links |
| MP-M | 101/2~111/2 | 12 |
| 111/2~121/2 | 13 | |
| 121/2~135/8 | 14 | |
| 135/8~143/4 | 15 | |
| 143/4~157/8 | 16 |
FCA ShangHai Plywood cases



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