Graph Tech RATIO 6-IN-LINE LOCKING 2-pin Tuners/Tuning Keys - CHROME PRL-8731-C0. Complete set of 6 tuners. The PRL-8731-C0 is a set of Ratio Locking Tuned Machine Heads for an electric guitar that uses six in line tuners. It has a classic shaped button, has a two pin casing and is finished in chrome.Ratio - Tuned Machine Heads are the first and only machine head to incorporate the different string gauges into the tuning equation. We balanced the individual gear ratios to each string dramatically simplified the tuning process. No more overshooting the G string or twisting away on the high E string. With Ratio, each half key turn equals one semitone change on all strings! Quicker, more accurate tuning on every string. Now includes InvisoMatch Standard Mounting Plates for easy installation. The item "Graph Tech RATIO 6-IN-LINE LOCKING 2-pin Tuners/Tuning Keys CHROME PRL-8731-C0" is in sale since Sunday, September 29, 2019. This item is in the category "Musical Instruments & Gear\Guitars & Basses\Parts & Accessories\Guitar & Bass Parts\Tuning Pegs". The seller is "guitaraudio" and is located in Pittsburgh, Pennsylvania. This item can be shipped worldwide.