64
Metal, about 1 inch in diameter
(i.imgur.com)
Let us help you identify that mysterious object you’ve found.
Currently in CHALLENGE mode: If you've got something obscure knocking about, post a picture, and let's see how we do. Please prefix such posts with "CHALLENGE:" so we know we've got a fighting chance.
Really? Then my guess is those may be for a tool to hook into for turning. All in all it looks like something pressure line or liquid line related