Stainless Steel parts are what you need for your Floyd Rose system.
Other cheap metal part used in some of these systems will ALL fail with time, when they don't fail from the get go.
Be aware that if you use Stainless Steel screws, the parts these screws fit also need to be made of hardened steel, otherwise you'll strip the threads of the nut base plate, the bridge plate and the saddles.
Floyd Rose MUST definitely provide these necessary Stainless Steel upgrades to the public. These are the parts necessary to ensure the longevity and stability of such locking tremolo systems.