Specification Of Thread Opener Bits
| Diameter（mm）D1 | Hole diameter（mm）D2 | Thread T | |
 | 76 | 26 | R32 |
| 89 | 43 | R32 | |
| 102 | 43 | R38 | |
| 115 | 76 | R38 | |
| 102 | 43 | T38 | |
| 115 | 76 | T38 | |
| 127 | 76 | T45 | |
| 140 | 89 | T45 | |
| 165 | 102 | T51 |
Thread Opener Bits
It is used in threaded drill pipe rig and enlarges the aperture on the basis of existing small holes.
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