SCREWS THAT YOU CAN DEPEND ON: Very strong and are great for both indoor and outdoor use. This stainless is superior to regular steel and provides excellent rust resistance. Widely used in wind power industry, the aerospace industry, office equipment industry, petrochemical industry, the electronics industry, the communications industry, shipbuilding industry, environmental protection machinery, etc. Our screw set is made up of High-quality stainless steel which is low in carbon and contains chromium at 10% or more by weight. Its perfect component gives the screws the ability to be able to resist corrosion or rust. Stainless steel can be used for a number of applications and throughout a number of industries. Whilst some stainless steel will retain high strength at high temperatures or will actually maintain high mechanical properties at cryogenic temperatures. 100% 304 Stainless Steel which is one of the highest forms of corrosion resistant steel, making it last longer than other hardware on the market today. We stock a wide variety of fasteners ideal for many applications around the home, farm, business, or automotive industries. Most of our fasteners have a light zinc plating over steel giving a more rust resistant finish. We also sell coated and stainless products for additional rust resistance. We stock many grades of fasteners ranging from low carbon steel on up to hardened, heat treated steel. Not all fasteners are applicable for all applications. Designed to spread the load of a screwed fastening and prevent loosening in industrial, shop, automotive and home appliances. ProTactical US strives to manufacture best possible products for our customers .We love our customers and emphasis on user experience ,we never finish improving our products!Life time warranty, a replacement will be sent to you for free when there is any quality problem, we will do our best to provide you a pleasure shopping experience.