I found this on our receptionist's desk a couple months ago. We are a manufacturing facility (machine shop) and have had various vendors in and out working on all utilities. This nozzle looks important, but no one here owns it, and nobody knows what it is.Overall length is 2-1/8". The small hole running through the "nozzle" is 3/16" dia. The knurled end in internally threaded with a 9/16" thread inside it. It's steel. It's a heavy precision machined piece.
If not a nozzle... possibly some kind of collet? Maybe a part of a pneumatic tool? Part of a hand tool? Any ideas?

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