Mechanical Internal Cutter Mechanical Internal CutterThe mechanical internal cutter is a special tool to cut pipe in pipe ... any position of fish. During cutting operation,the releasing spear can be connected above internal cutter, after finish cutting,pipe string above ... /2"(Casing)JNGD168138NC38144~1536 5/8"(Casing)JNGD178145NC38150~1667"(Casing)Releasing Overshot,drilling rig tools,casing tools.