The 97 Series is classic in design and feature a stylish stamped plate with a butter bean button. These classic machine heads offer smooth, accurate tuning for your solid guitar headstock. For Solid Guitar Headstocks (Vertical), 3 Treble and 3 Bass, Set of 6. Open gears with 14:1 gear ratio 23/64” post hole Post length to hole: 22.53mm Overall post length: 28.77mm Weight per pc/per set: .8oz/4.8oz Max. string gauge: .074” Comes with Dunlop polishing cloth bundle and hardware (bushings, screws)