FeaturesSet of six white "chicken head"-style amplifier control knobsSet screw mounting (screws sold separately)Introduced on tweed-era Fender amplifiersUsed on '59 Bassman®, Blues Deluxe™, Blues Deville™, Hot Rod series, Prosonic™, '57 Twin®, '57 Bandmaster®, EC Series, and Bassman TV series amplifiersFits most 1/4" solid shaft potentiometers on vintage and modern amplifiers and guitars