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The original was posted on /r/whatisthisthing by /u/pussyboi4209669 on 2023-10-03 11:31:45.

Original Title: I found this on the floor. Looks like it was painted black and rusted. It’s pretty dense, so a heavy metal. I thought it was a nut of some kind but it has no screw in hole and doesn’t look broken off, atleast not recently