FIX-OR-11 is a type of rivet, also known as an AN387-11A Rivet. It is made of steel and has a diameter of 1/4 inch. The rivet is commonly used in the aeronautics and aerospace industries, as well as the automotive industry. The rivet is often used to join two or more parts together permanently. It is easy to use and is often used as a substitute for welding or brazing. The ribbed head of the rivet provides an additional grip on the part, meaning that the joint is stronger and less likely to come apart.