The PRL-9721 is a set of Locking RATIO® Calibrated Machine Heads for electric guitar that use 6-in-line tuners with staggered posts (eliminates the need for a string tree).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.
Ratio patented gear technologyRatio - calibrated machine heads incorporate different string gauges into the tuning equation.From low e to high e 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.Gear ratio: unique for each string position - one turn-one tonePeg holes diameter required: 13/32" (10mm)String post diameter: 0.236" (6mm)String post length to string hole: 0.827” (21mm) - 0.787" (20mm) - 0.748" (19mm)Weight per single machine head: 0.083lbs (38g)Weight per set of six: 0.496lbs (225g)String diameter up to 72 gaugeIncludes 6 machine heads, mounting screws and bushingsIncludes complimentary 4 sets of aluminum mounting plates