Durible Material - Aluminum rivet body and steel rivet mandrel with Zinc Plated finished, with lightweight but strong and better corrosion resistance.Great Accrssory - Widely used in buildings, cars, ships, aircraft, machines, electrical appliances, furniture and other products. Great for both indoor and outdoor use.Firmly Performence - Strong enough to support all of your projects. Superior corrosion resistant suitable for salt water applications.Professional - Need special tools (like Riveter) to mounting this blind rivets.Features - Open end blind rivets with break pull mandrel, extoa long rivet body and flat round head.