Shower drain removal

I'm trying to remove the shower drain as it has become corroded. I don't know the first thing about how to proceed. It is in a mobile home if that matters any.

Hopefully your's is somewhat similar to this. The dumbell wrench would fit the crossbars in the drain and screw it out.



The problem you will face is finding the replacxement that has matching threads to your drain. You may have to replace the entire waste and overflow.