GroverSta-Tite Guitar Tuners/Machine Heads, Set of 6 (3 Treble/3 Bass), Chrome Finish, V97C

They went on guitar with no problem. Looks great

Perfect fit on my 40+ year-old Yamaha acoustic. Guitar sounds amazing with these tuners, and I've gone a week so far without having to re-tune! I used to have to tune my guitar every other day.