The Grover Sta-Tite 97-18 series chrome button tuning machines provide precision tuning for your instrument. With an 18:1 gear ratio, you'll achieve minute tuning adjustments with just a slight turn of the butterbean buttons. The die-cast plates and open gears give these machines a classic look while the 22/64" post holes and .074" maximum string gauge accommodate a variety of string types. Everything you need to install these tuners comes included so you can upgrade your tuning hardware in no time. For smooth, accurate tuning performance, the 97-18 series tuners are an excellent choice.