What is this bit designed to do?

tim2020

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I am a complete novice and have no idea. The O.D. of the thread is 6.85mm.

DSCN3569.JPGDSCN3565.JPG
 
There you go. The original piece is as I guessed. The knurled piece is the draw bar. The largest piece looks like it adapts the collet type to a spindle (lathe?) taper. Google "spindle taper dimensions" and "collet dimensions" if you want to identify them beyond my opinions.
 
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