Are these chromed rounds?

[gabatgh]

Hi folks!

 

I'm trying to id three items for a friend of my wife's. (I'm the guy that people bring the weird stuff to).

 

She has what looks like three large rounds, two smaller and one much larger, but they're shiny like chrome. She says the big one weighs about ten pounds. All three have a hole in the bottom/back/flat side. The only identifying marks is larger one, with the numbers 75 and 2. I'm thinking they're chromed because on the bottom of one of the small ones it looks like a piece is missing.

 

She said that when she tapped them together they sounded like steel.

 

It's been a long time since I couldn't id something! :D

 

Thanks so much!