304 stainless steel has good corrosion resistance in a bad environment like high temperature, cold weather, and high humidity areas. They have superior rust resistance and the excellent of oxidation resistance. These nuts are very strong and are great for both indoor and outdoor use. The larger outside diameter perfect for applications that require a larger amount of pressure distribution such as drywall, fencing, mounting fixtures, and sheet metal. (A2-70 cold-worked Stainless Steel, also known as 18-8 or 304 Stainless Steel, 18-8 stainless steel nuts have good chemical resistance and may be mildly magnetic). WARRANTY: Persberg hardware come with a 100% Satisfaction Guarantee, if you have any problems we will replace them free of charge!