These are called AC Pannier rails, luggage rails or saddlebag supports and used when installing saddlebags. Manufactured from 16mm diameter grade 304 stainless steel tubing with a 1.25mm wall thickness. Welds are smooth for a detailed professional finish. / Fitment: Triumph: 17-20 T100; 16-20 T120; 16-20 Street Twin; 17-20 Street Scrambler; 16-20 Street Cup