在该工具内面的特殊的经硬化处理的金属割刀与落鱼的外表面接合。
Special hardened metal-cutters on the inside of the tool engage on the external surfaces of the fish.
在打捞作业中所用的一种井下工具，在打捞时它与管子或工具的外表面接合。
A downhole tool used in fishing operations to engage on the outside surface of a tube or tool.
外割刀一般用来去除落鱼的最上面的可能被损坏的部分，以便使打捞筒或类似的打捞工具与未损坏的表面接合。
External cutters are generally used to remove the topmost, possibly damaged, portion of a fish to enable an overshot, or similar fishing tools, to engage on an undamaged surface.
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