Grover Sta-Tite 3+3 tuning keys in nickel finish. The classic open-gear, butter bean button, and 14:1 ratio makes this a favorite for slotted headstock acoustic and electric guitars. Includes press-in bushings and mounting screws. Posts are 6mm diameter. Bushings require 11/32"(8.75mm) peghead holes. Mounting holes on each tuner are spaced 1"(25.4mm) apart. Features Grover's lifetime guarantee.