The rings come from how the chert was formed, think of a jaw breaker.
This turkey tail is 5 inches, this is a average size for the point type.
They were not spears or arrow heads. They are almost always found in graves and killed by killed i mean broke with 1 clean strike. I think that were warn around the neck with a leather thong as a form a functional jewelry. I think when a person of this culture died then they would kill the blade and toss it in the grave with them as part of a ceremony.