Kluson Oval Metal Button Tuners, 3 Per Side Complete set with both bass and treble side individual tuning machines. Includes bushings and mounting screws. Historically correct replacement for many ‘50s and ‘60s Gibson®, Martin®, Kay®, Epiphone®, Guild®, Rickenbacker® and ‘60s through ‘80s Mosrite® guitars. Used on Gibson® ES-330, Epiphone Casino From 1956 - 1964 was also used on some high end Kay® electrics. From 1956 - 1963 was used on Guild Aristocrat M-75