Graph Tech PRL-8311 Electric Locking 3x3 Contemporary Machine Heads - Gold

RATIO® 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.
Graph Tech 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.

The PRL-8311, 8322, 8331, 8341, and 8351 are right-handed sets 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. It has a two-pin casing that can be used as is, or with Graph Tech'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.

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 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