It is a tapping chuck, for machine tapping. The 3 jaws tighten on the shank, the top sliding part is tightened to the square of the tap.
Could you show a pic of the taper shank side of the head, please? May help identify make.
Jon (Dec 11, 2020), KustomsbyKent (Dec 11, 2020), Moby Duck (Dec 11, 2020), suther51 (Dec 11, 2020)
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