Graph Tech Ratio Locking Tuner 7 string 3+4 - Black

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RATIO® patented gear technologyRATIO® - Calibrated Machine Heads incorporate different string gauges into the tuning equation.From Low B to High E 48:1, 39:1, 24:1, 20:1, 35:1, 20: 1, 12:1.We balanced the gear ratios to each string simplifying the tuning process.With RATIO®, a half-turn is a semi-tone!Every string reacts the same to any tuning adjustment. Predictable, precise tuning, on every string. Features The PRL-8621 is a right-handed set of Locking RATIO® Calibrated Machine Heads for electric guitars that use a 3 x 4 tuner configuration. Fits many Jackson, Schecter, and Ibanez (selected) style guitars and a lot of acoustic guitars if you want to upgrade to a locking set of machine heads. It has a two-pin casing that can be used as is, or with our Patented InvisoMatch Mounting Plates [opens in new tab]. 4 different sets of InvisoMatch mounting plates in brushed aluminum are included to make installation on most guitars fast and accurate by using your existing screw mounting holes. Specifications Gear ratio: unique for each string position - one turn-one tone Peg holes diameter required: 13/32" (10mm) String post diameter: 0.236" (6mm) String post length to string hole: 0.910” (23mm) Weight per single machine head: 0.083lbs (38g) Weight per set: 0.581lbs (266g) String diameter up to 72 gauge Includes 7 machine heads, mounting screws and bushings Includes complimentary 4 sets of aluminum mounting plates Show more