It is a hammerless drift remover for removing chucks or drills. Where we would normally use a struck wedge style this thing rotates eccentrically to push the center wedge out to pop the chuck out of the sleeve. Using this doesn't risk damaging the spindle bearings from you whacking on them sideways.What is it?

How do you suppose I learned what it does?I love the constant "look at this thing that I found, and you've never seen before" threads here where the OP posts a picture but doesn't say WTF it is without being asked first. Why not just tell us right away? Suspense? Getting 10 posts with incorrect guesses makes you feel more knowledgeable than the rest of us idiots? Why not just tell us in the first post what it is?
Don’t pay any attention, he got up on the wrong side of the garage. I think it’s interesting to see guesses, or the odd person who knows.A mullion apologies that you had to scroll down 2 posts to find out what it is.