Releasing and Circulating Overshot
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The releasing and circulating overshot is a special external fishing tool used for fishing drill collars, drill pipe, oil tubes and other fishes in drilling and workover operations. The overshot can effectively engage and pull out fish without grapple biting.
Specifications| Type | O.D （ mm ） | Max. catch size （ mm ） | Thread | |
| Spiral grapple | Basket grapple | API | ||
| 89 | 60.3 | 47.6 | NC26 | |
| 92 | 73 | 63.5 | NC26 | |
| 95 | 76.2 | 66.6 | NC26 | |
| 102 | 73 | 60.3 | NC26 | |
| 105 | 85.7 | 73 | NC31 | |
| 114 | 89 | 75 | NC31 | |
| 117 | 89 | 78 | NC31 | |
| 127 | 95 | 80 | NC38 | |
| 143 | 120.6 | 102 | NC38 | |
| 152 | 128 | 111 | NC38 | |
| 168 | 127 | 114 | NC50 | |
| 168 | 139.7 | 120.6 | NC50 | |
| 181 | 146 | 127 | NC50 | |
| 194 | 159 | 141 | NC50 | |
| 200 | 159 | 141 | NC50 | |
| 206 | 178 | 163 | NC50 | |
| 206 | 168 | 152 | NC50 | |
| 219 | 178 | 159 | NC50 | |
| 232 | 203 | 187 | NC50 | |
| 244 | 206 | 184 | 6 5/8 REG | |
| 260 | 219 | 200 | 6 5/8 REG | |
| 270 | 228.6 | 209.6 | 6 5/8 REG | |
| 273 | 241.3 | 216 | 6 5/8 REG | |
| 286 | 244.5 | 225.4 | 6 5/8 REG | |
| 298 | 257 | 238.1 | 6 5/8 REG | |
| 340 | 286 | 260 | 6 5/8 REG | |
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