Q: What kind of metals will the disc mount stick to?

A: Any metal that contains a significant amount of iron, such as galvanized steel sheet. Truthfully, it is easier to tell you what common metals that the disc mount will not stick to. They are: aluminum, copper, nickel, titanium, most grades of stainless steel, and brass. If you are not sure what the metal is you are considering, simply test it with any magnet you have around the house to verify if it will work for you.