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QM type impression block is an effective tool used to determine the dimensions, configuration, condition, and location of the top end of a fish in the hole.
| Model | O.D(mm) | I.D(mm) | Thread connection(BOX) | Casing/tubing Size(in) | Code |
| QM79 | 79 | 12 | NC23 | 4 | X03-7900 |
| QM89 | 89 | 12 | NC26 | 4 1/2 | X03-8900 |
| QM98 | 98 | 12 | NC26 | 5 | X03-9800 |
| QM110 | 110 | 12 | NC31 | 5 1/2 | X03-11000 |
| QM146 | 146 | 20 | NC38 | 7 | X03-14600 |
| QM203 | 203 | 25 | NC50 | 9 5/8 | X03-20300 |
| QM305 | 305 | 38 | 6 5/8REG | 13 3/8 | X03-30500 |
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