Grover Sta-Tite Guitar Tuners/Machine Heads, Set of 6 (3 Treble/3 Bass), Chrome Finish, V97C Open Gear V97C Grover Grover Sta-Tite 3+3 tuning keys in chrome finish in chrome finish. The classic open-gear, butter bean button, 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 1"(25.4mm) apart