Need Help Identifying

[tred1956]

This came with a RCBS Big Max A4 press I bought. Has a standard press thread. Assuming converts to arbor press? What is it and what is it used for? Who Made it?
Thanks in advance,
Doug
https://i.postimg.cc/qvVcGDwz/16938520549725212312289186693147.jpg (https://postimg.cc/ppCnWZgH)
https://i.postimg.cc/cL0hS5nP/16938520841984458437663887238155.jpg (https://postimg.cc/QHY1gmSq)
https://i.postimg.cc/0NsYg9tp/16938565847231314841104439692138.jpg (https://postimg.cc/0zVMD11Q)

[Sasquatch-1]

It appears to be an anvil for converting to an arbor type press.

[jsizemore]

Especially when your sizing and seating the big cartridges using LE Wilson hand dies.