What am I?

Can you guess what this is? For the macro-guess challenge.

[KWind]

Nice macro! I'm not sure what it is.

[Lastrami]

Great photo, I guess it's a lens mount or extension tube (with contact pins).

[Jane Pittenger]

I’m guessing lens mount

[Monica]

@kwind Thanks for commenting!

[Monica]

@lastrami_ @monicac Thanks! You are both very close, it's a macro extension ring.