Graph Tech 3+3 Ratio Acoustic Guitar Machine Heads Butterbean Open Back - Nickel

RATIO® patented gear technology
Calibrated Machine Heads incorporate different string gauges into the tuning equation. 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 PRN-3422 is a right-handed set of open-back RATIO® Calibrated Machine Heads for acoustic guitars that use 3+3 side tuners.

Specifications

- Gear ratio: unique for each string position - one turn-one tone
- Peg holes diameter required: 0.346" (8.8mm)
- String post diameter: 0.236" (6mm)
- String post length to string hole: 0.827"; (21mm)
- Weight per single machine head: 0.055lbs (25g)
- Weight per set of six: 0.331lbs (150g)
- String diameter up to 72 gauge
- Includes 6 machine heads, mounting screws, and bushings