| Customized: | Customized |
|---|---|
| Standard: | API |
| Type: | Center Drill Bit |
|
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- Bearing polishing process after finish turning, improve bearing performance
- Dynamic lubrication system
- Professional & stable heat treatment, High quality control
- Welding process, more wear-resistant
-Produce strictly in accordance with API standards
- Special materials of Tricone bits
-Fast delivery & Best factory price
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