✅ SOLVED Hexagonal thing with screw?

[BillW212]

Found this thing today. No idea. At first I thought it was a lug nut. After I cleaned the dirt off, it is a hexagonal nut looking thing with a screw in it and a knob to turn the screw. It is flat on the back. I took several pictures and made a composite. Can't imagine what this could be used for. It was the best signal I got in the short time I was out today. Read like a coin.

 

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[creskol]

That goes on a framing square to duplicate roof pitches, etc. Usually there are two .. one for the rise and one for the run.

https://www.google.com/search?q=fra...w&biw=1920&bih=889&sei=SC0lUrK-E7CwsATpvIHYCg

 

[BillW212]

Thanks, creskol. That makes sense. Everything else I found near it was scrap aluminum and construction waste.