What is this Tool?

[Craig Schulz]

I just found this while organizing my garage and can't remember what it is for, if I ever knew. Can anyone tell me what this is?
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[Mick Simon]

It's a centering cone for a router base. Chuck it up into the collet and loosen the screws on the base and use it to align the base concentrically with the spindle.

[Craig Schulz]

Thank you Mick!