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Can anyone tell me what this might be used for? I found it in a box with some other electrical things, but I don't recall when I got it. It might have come with another tool like a soldering iron.

It's definitely injection molded, and appears to be glass filled nylon as far as I can tell. There are no markings on it.

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It is a soldering aid tool.

Used for holding components down while soldering.

The slot is for manipulating wires.

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    That part looks like the deleted post from A.I.Bevelri. we usually call them swizzle sticks. Since it looks to be all plastic could it handle the heat from a soldering iron? I believe peek plastic can handle high heat but my soldering tools have metal tips. – Ed Beal Oct 28 '18 at 10:37
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Very late answer: it's a "pot twiddler" for adjusting trimmer potentiometers (variable resistors) and capacitors. It's plastic so as to be non-conductive and fairly low capacitance, "wire holders" etc. are usually aluminium to withstand heat but not be solderable.

Some of the "high end" ones, e.g. made by Bourns, have a small piece of brass shim as the screwdriver tip to make it last longer... I've got one somewhere which must be 30+ years old. There are comparable tools for getting inside inductors, but these are much less important than they used to be in the days of superhet radios.

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