Grover Super Rotomatic 3+3 tuning key set in black finish. The Super Rotomatic features an eye-catching art deco style button. 14:1 ratio. Includes screw-in bushings and mounting screws. Great for replacement on Gibson® and other guitars with 3+3 headstock. Requires 3/8"(10mm) peghead holes. Features Grover's lifetime guarantee.