[Closed] Change parameter for multiple materials in one time

I’m looking for a script that allows me to do this:

once selected a lot of objects (with different standard materials apply to them) I need to modify some parameter all at once, for example set “Specular Level” to 0 for all Standard material of all selected objects.

Till now I’m using SoulBurn script to move material of selected object into the material editor and then execute a simple “for” cycle that allows me to set Specular Level for all material into the material editor, but I can do this just for 24 objects at time; while my scene have much more.

Thank you.