MS20427 Rivets are Military Spec Solid Rivets that come in a variety of Materials including Aluminum, Copper, Monel, Steel, and Stainless Steel. MS20427 Solid Rivets have a 100 Degree Countersunk Head Style and typically come in a Plain Finish, but can also utilize an Annealed, Passivated Finish, Cadmium/Yellow Chromate Finish, or Black Oxide Finish . MS20426 Rivets can have a Diameter ranging from 1/16 to 3/8, and a length from 1/16 to 3 or more depending on the Diameter.