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. 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.