Grover Sta-Tite 3+3 round button tuning keys in nickel finish. The classic open-gear and 14:1 ratio makes this a favorite for both acoustic and retro electric guitars. Includes press-in bushings and mounting screws. Requires 11/32″(8.75mm) peghead holes. Mounting holes on each tuner are spaced 15/16″(23.5mm) apart. Features Grover’s lifetime guarantee.