  Bumper plating T-nut.
This is one of the titanium T-nuts that holds bumpers to their racks while they are being electroplated in the factory that makes the beautiful nickel nodules listed several samples back. I got it from one of the plating engineers when I was researching a Popular Science column about the nodules (scheduled to be published in the April 2006 issue).
Source: Anonymous
Contributor: Anonymous
Acquired: 20 December, 2005
Text Updated: 31 January, 2006
Price: Donated
Size: 4"
Purity: 99.9%
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