Aluminium extrusion is the manufacturing process behind nearly every modern aluminium batten, slat, and louvre profile. Heated aluminium alloy billet is forced through a steel die and emerges as a continuous length of profiled material that gets cut and stacked.
Extrusion is what makes aluminium so versatile for fence and gate infill: any complex cross-section can be made cheaply at volume. Suppliers like Knotwood, Dimet, ProFab, and Lockwood publish catalogues of dozens of profiles (50x16 plain, 65x16 plain, 65x16 oval, 80x40 box slat, 105x32 louvre, etc) that go straight to gate fabricators.
For CAD60, the configurator's 'extrusion picker' lets you select any of the supported profiles and the geometry engine recomputes the gate face accordingly.