Part of Graph Tech's Ratio Series, this set of six-in-line locking tuners feature handy thumb-screws and staggered posts that do away with the need for a string tree and support quick-and-precise tune-ups. Needless to say, these premium electric guitar tuners boost the tuning stability too, and the patented Ratio design makes sure that every quarter, half or full turn results in the same shift in pitch (e.g. a half-turn always results in a semitone step up or down). Your guitar strings are effortlessly secured round the back of the tuners via the fitted thumb-screws and you can use the four included sets of InvisoMatch mounting plates with most standard ferrule and screw hole layouts.