It isn't magnetic and don't appear to be plated. The item is .17 inches long and .3 inches in diameter. The hole in the base is about .15 inch diameter .4 in depth and the narrows to a small hole the size of a paper clip and out the tip.
This was found in a box kept by a WWII veteran. It was with his dog tags, spent bullets a Invasion pamplet for Papua New Guinea and other items. I don't know if this item has any connection to his military service but everything else in the box was.
Thanks for any help.