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Fishing neck (FN)
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Fishing neck (FN) is a profile on the upper section of a tool, it can either be outside or inside the tool.
It is Used to retrieve lost tool-strings in the well.

There are numerious types and sizes of fish necks.
Here are a couple of examples, and examples of tools used to latch onto them.

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Examples of fishing tools used to retrieve lost toolstrings.

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