Thanks, mklotz. Such a handle could be helpful in some tasks, although for grinding points on cylindrical rods, I prefer to mount them on the cordless drill, and for grinding or polishing irregular pieces I like to use hand vises.

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By de way, I forgot to mention another pin vise similar to the first one.

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These pin vises are very useful because in addition to a basic set of bits, a special tool can be made at any time and it is not necessary to have a handle for each tool.