What do I need a freewheel remover tool for?

I'm going senile, I know it. UPS just delivered an Amazon package with a ParkTool FR-8 FREEWHEEL REMOVER. I remember ordering it, but not why. I'm pretty sure the purchase was prompted by a thread I was reading a couple of weeks ago. I'm hoping someone knows what I'm talking about before I check into the assisted living down the road.

https://images-na.ssl-images-amazon....nqL._SY90_.jpg

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Originally Posted by UtahPete

I'm going senile, I know it. UPS just delivered an Amazon package with a ParkTool FR-8 FREEWHEEL REMOVER. I remember ordering it, but not why. I'm pretty sure the purchase was prompted by a thread I was reading a couple of weeks ago. I'm hoping someone knows what I'm talking about before I check into the assisted living down the road.

https://images-na.ssl-images-amazon....nqL._SY90_.jpg

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Rear wheel bearing retainer

Quote:

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Originally Posted by PMK

Rear wheel bearing retainer

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Ah, yes! Thank you! Saved me from an early dotage.

I hope I got the right one. This is a four-notch model for 30 x 1mm thread hubs.