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Drill Collar
Main technical parameters:
| Specification | NC23-31～NC70-100 |
| All series of API specifications | |
| Executive standard | API Spec 7-1 API Spec 7-2 |
Main technical parameters:
| Specification | NC23-31～NC70-100 |
| All series of API specifications | |
| Executive standard | API Spec 7-1 API Spec 7-2 |
Main technical parameters:
| Specification | NC23-31～NC70-100 |
| All series of API specifications | |
| Executive standard | API Spec 7-1 API Spec 7-2 |
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