MS16535 Rivets are Military Spec Semi Tubular Rivets that come in Aluminum, Brass, Copper, Monel, Stainless Steel, and Steel. MS16535 Rivets have an Oval Head, and often come in a Plain finish, but are also known to have a Gold Chemical Film finish as well as Nickel, Black Oxide, Passivate, or Cadmium/Yellow Chromate finishes, depending on the material.