Don't know the name, but probably part of an auto, bicycle, or motorcycle "set." The hole in the middle was probably for a bolt that held the set together. Such sets came in more substantial forged steel versions; I have one of the more substantial versions in my "gee, these are interesting wrenches" box. I'm not a wrench gatherer, like many folks here are, so the box isn't very large; and it's pretty well buried behind/below other tools, so I can't easily pull it out for a show and tell.