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DKJ type reverse joint is a special tool for reversing stuck drill stem above stuck point in drilling and workover operation. In treatment of stuck drill stem, it can work as a fishing pin tap in reversing operation. When fish is stuck or cannot be reversed in fishing or reversing operation, the fish can be reversed from reversing sub and the fishing drill tool is tripped out.
| Thread Conn (RH) | I.D (mm) | Min. Fishing size (mm) | Lead in Diameter of Spear Rod(mm) | Code |
| NC26 | 7 | 39.7 | 37 | L10-4810 |
| NC31 | 8 | 49.7 | 46.S | L10-6000 |
| NC31 | 8 | 62 | 56 | L10-7300 |
| NC31 | 16 | 75 | 71 | L10-8900 |
| NC38 | 16 | 88.2 | 83 | L10-10200 |
| NC3B | 16 | 99.8 | 93 | L10-11400 |
| NC38 | 20 | 107 | 98 | U0-12700 |
| NC38 | 25 | 118 | 107 | L10-14010 |
| NCS0 | 30 | 1S0.4 | 142 | L10-17800 |
| 6 5/8REG | 70 | 2135 | 205 | U0-24500 |
| 6 S/8REG | 70 | 232.6 | 2 IS | U0-27300 |
| 6 S/8REG | 76 | 313.6 | 253 | L10-34000 |
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