Whatsit?

[Garabaldi]

One end is threaded and the other is cylindrical. Material seems to be lead. Not sure why it would be threaded, because it is not cylindrical.
It seems like its in its original shape and not flattened. Found at a old military training post.

 

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[kenley]

concrete anchor.

 

[Two Dogs]

Most certainly a concrete anchor! They are still used today. Two Dogs

 

[flip flop]

Concrete anchor. Used some today.

 

[Garabaldi]

Thanks all, Great ID. I had no idea.