Stainless steel bolts, nuts, screws, washers and pop rivets are used to fight corrosion. Stainless steel fasteners provide superior resistance to rust, staining and corrosion. When looking for fasteners to fight the outdoor elements, especially water, stainless steel nuts, bolts, screws, washers and pop rivets should be your first choice. Stainless steel finish is determined by the amount of chromium present in the material.