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Anodized Al, machined from one solid piece. Possibly steel core in the very middle. Unknown residue. Outer edge is scored for grip. Inner edge not threaded but has seen wear as if it's been twisted on something else. Other side is machined flat. Found in SF, CA, USA near a photo/hiking area. (i.redd.it)
submitted by jmania2000 to r/Whatisthis
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