

Help with identification needed
This driver was in a box of tools I got at auction.
It Is basically a long shaft 5/16 hex nut driver, but it has a post in the middle of the socket which is about 1/8” in diameter. The post is slightly magnetic and does not move in or out. I assume it is some type of security fastener driver, but I haven’t found a match searching on line. It’s like a pin hex fastener head, but on a driver handle.
EDIT: Additional information -
I was able to pull the magnetic center post out. It’s approximately. 1/2” long and is seated in what appears to be a nylon sleeve. The sleeve did not move when I tried to pull it out with a pick.
Google lens has not been any help.
There are no markings on the handle or the shaft.
Just curious what it might be.