Mechanical internal cutter is a tool which is used for cutting downhole fixed (or stuck)pipe from inner of casing,it can work at any place except joint and coupling.
| Model | Cutter OD | Casing/TubingSize | Cutting Thickness | Connection |
| mm(inch) | inch | mm | ||
| ND73 | 57(2-15/64) | 2-7/8 | 5.5 | 1.9TBG |
| ND89 | 67(2-41/64) | 3-1/2 | 6.5 | 1.9TBG |
| ND102 | 85(3-11/32) | 4 | 5.7～6.7 | 2-3/8TBG |
| ND114 | 89(3-1/2) | 4-1/2 | 7.4～10.9 | 2-3/8TBG |
| ND127 | 102(4-1/64) | 5 | 5.59~11 | 2-7/8REG |
| ND140 | 120(4-23/32) | 5-1/2 | 7~9.2 | NC31 |
| ND168 | 149(5-7/8) | 6-5/8 | 7.3~8.9 | NC38 |
| ND178 | 146(5-3/4) | 7 | 5.87~13.72 | 4-1/2REG |
| ND244 | 212(8-11/32) | 9-5/8 | 7.92~13.84 | 6-5/8REG |
| ND340 | 295(11-39/64) | 13-3/8 | 8.38~12.19 | 6-5/8REG |
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