metal wheels on skates of my childhood weren't made of much . one thing I'm pretty sure of and that it's not a valve handle.More heavy duty
i think im changing my vote lol. can we see a picture of your thing, from the angle in the above pic. The face of it, or is it identical to the backside.Vintage roller skate wheel.
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it looks heavy duty , is it? if light I'd say skate wheel if heavy , mechanics creeper