Threaded rod (only) for third valve slide stop mechanism on Bach AB180 series Artisan Stradivarius trumpets. This rod is longer than the standard 180 Stradivarius series rod, allowing low F to be performed more cleanly. Silver plated. Set screw and stopnuts are sold separately: • Set Screw - 070938 • Stop Nut - 066909 (silver plated) • Stop Nut - 066910 (nickel plated)