The PRL-8341 are a right-handed set of Locking RATIO® Calibrated Machine Heads for electric guitars that use 3 x 3 tuners, such as Gibson style and PRS style guitars. A great upgrade over single gear machine heads, such as Grover, Schaller, Sperzel, Kluson, etc. This set has keystone style knobs.

The tuners have a two pin casing that can be used as is, or with Graphtech’s Patented InvisoMatch Mounting Plates. 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® is Graphtech’s patented gear technology. RATIO® 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.

Graphtech balanced the gear ratios to each string simplifying the tuning process. With RATIO®, a half turn is a semitone. Every string reacts the same to any tuning adjustment. Predictable, precise tuning, on every string.

Specifications:

• Gear ratio: unique for each string position - one turn-one tone
• Peg holes diameter required: ~\frac{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 of six: 0.496lbs (225g)
• String diameter up to 72 gauge
• Includes 6 machine heads, mounting screws and bushings
• Includes complimentary 4 sets of aluminum mounting plates