Got This In A Box Of Tooling...what Is It?

[sd624]

Thanks guys for the help!!! If I keep them I will be making an arbor. 300 bucks for one from pctooling seems a little steep to me.

 

[hman]

Just found two more similar to the other ones except these are made by Precision
Components in Troy Mi.
View attachment 98989

Take a careful look at the round-insert cutter. It appears that one of the inserts is mounted backward!