200 Pcs 5/64" x 5/16" Aluminium Round Head Solid Rivets Knurled Shanks Inexpensive alternative to threaded fasteners. Solid rivets are the strongest rivets used in fastened joints. Swelling of the shank occurs most by the clinched head end of the rivet. Rivets can be hardened for some applications to improve strength and durability. Solid rivets are one of the oldest and most reliable types of fasteners.