TonePros KF6B are designed for the 6-in-line format. These tuners are designed with classic features but with performance in mind. F6B Series tuners pay critical attention to the all-important winding height, which is necessary for the split/top load design of yesteryear's 6 on a side tuners. F6B features the same high-performance machine gears of the other B Series tuners, including the extremely tight, 15:1 high gear ratio. Special clipped 7 screw set based plates are included for classic vintage appearance, and classic matching finish metal buttons are standard for this model. Retrofit your vintage guitar with no modification.