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It is a nut that is installed with a rivet type gun. The lower half compresses to hold it in the hole so that a bolt can be inserted. My bet is that only the top 1/3 has threads.
It is a nut that is installed with a rivet type gun. The lower half compresses to hold it in the hole so that a bolt can be inserted. My bet is that only the top 1/3 has threads.
Trust me this is what it is. I have a box of them in the garage.