50 Non-penetrating fasteners. Our specially designed fasteners are made from 100% aluminum so they will not corrode with time. Designed to hold up to extreme weather conditions. Our fasteners will work with almost all solar panels manufacturers' products. Will not damage the panels thereby protecting your solar panel warranty. Washers are painted black on one side to match the screen for a neat appearance and ease in installation. We recommend using our PVC coated wires that are made of galvanized steel and coated for extra protection and appearance. Check out our complete kits on our products page.