A brass washer is a small, flat, circular metal disk with a hole in the center. Its typically made of brass, a copper-zinc alloy known for its corrosion resistance and durability. Washers are commonly used to distribute the load of a threaded fastener, such as a bolt or screw, over a larger surface area, thereby preventing damage to the material being fastened and providing a more secure connection. Brass washers are often preferred for applications where corrosion resistance is important, such as in plumbing, electrical, and automotive systems. They can also be used for decorative purposes due to the attractive appearance of brass.