Structural rivets are used to fasten two pieces of material together where increased strength is required for greater Tensile and Shear Strengths, these are only available in 4.8 and 6.4 Diameters, and in Dome/ Protruding Head and CSK Head styles. These are availbale in Steel, Stainless Steel and Aluminium, and require specialised tooling to place these rivets. Generally known as Mono Rivets.