[villagetinker]

You can also contact the Sumter County Building department and get a copy of your house plans that will tell you where the metal studs are used.

As for mounting items to metal studs, there are special screw assemblies just for metal studs, DO NOT USE the plastic expanding plugs, as these will be cutoff when you insert the screw and you will have a lot less holding power than you expect (I know this for a fact, I had it happen to me....).