This set of 6 in line right handed Graph Tech Ratio electric guitar tuners feature a different gear ratio on each tuner to provide consistent tuning across all strings. The thicker the core diameter of the string the more sensitive it is to tuning and so using a 12:1 ratio on the high e tuner and up to a 39:1 ratio on the low E (which is a thinner core but wound) ensures they feel the same to tune with one turn of any Ratio tuner changing the pitch by about one tone, this speeds up tuning and making it easy to reach the desired note. The double enveloping hardened steel gears mesh and turn smoothly and precisely and backlash is minimised. The tuners have two mounting pins which fit in to holes in the back of the headstock to stop the tuner rotating and the Ratio tuners include Graph Tech's InvisoMatch mounting plates which adapt all common screw placements to the two pin tuner (mount the plate to the headstock, then mount the tuner to the plate) meaning these tuners can be installed on most guitars with no modification. The InvisoMatch mounting plates included adapt the following screw styles: Kluson Deluxe 2 screw, 45 degree screw (common on Ibanez, Schecter, ESP/Ltd and Jackson guitars), centre screw (common on Gibson Les Paul style guitars) and F style 2 screw. The plates are reversible so can be used for both right and left handed 6 in line headstocks.