What is This Metal Ring Behind my Plasterboard General problems, solutions, information and advice on fixing to walls of all kinds

[kumar]

I am planning to wall mount my TV and was looking for a stud in an internal wall. Hit something metal like behind my plasterboard (in picture). It looks like a metal ring and there is atleast one more on the same vertical line a few inches above. Although there is none a couple of cm above(smaller hole in the picture). Any idea what it is? There is nothing solid behind this ring. I cant seem to find a stud either. This is a new build ground floor apartment and is only a few months old.