Caps & Discs are machined from aircraft-grade aluminum. They come in 1-1/4" and 2-1/2" sizes for finishing or terminating StructureLite extrusion profiles of those sizes.
End Caps provide a finished end to otherwise exposed extrusion ends.
Dome Caps are 1-1/4" diameter and can be used as a foot for 1-1/4" extrusion, or with the addition of a 2-1/2" Diameter Cap can work with 2-1/2" StructureLite extrusions.
2-1/2" Diameter Inserts fit into SL-2.5 Tube for a finished end.