Detail 01
10 mm required peg holes
Verify the peg-hole diameter before fitting the machines.
Product detailSKU #1500000398490
Graph TechRatio 3+3 Acoustic Guitar Tuning Machine Heads Gold 6 String
Independent shopping perspective
The Korena take
For a right-handed six-string acoustic with a three-per-side headstock, this gold Ratio machine-head set uses string-specific gear ratios to make tuning changes respond evenly from string to string. Turning a key through 180 degrees changes pitch by one semitone. The two-pin housings may be installed directly, and the package also includes four sets of brushed-aluminum InvisoMatch mounting plates for using existing screw holes on most guitars.
Strong match
Who this is for
- Updating a right-handed acoustic guitar with three tuning machines on each headstock side.
Consider the trade-offs
When to look elsewhere
- Six-in-line headstocks or left-handed guitar tuner layouts.
What matters in use
The specifications, translated
Catalog numbers tell only part of the story. These are the details most likely to change how this product feels, sounds, or fits into a setup.
Detail 02
Gear ratios: 39:1, 24:1, 20:1, 14:1, 20:1, 12:1
The six machines use individually calibrated ratios.
Final check
Know before you order
- 01Confirm a right-handed 3-per-side headstock and 10 mm peg holes.
- 02Four brushed-aluminum InvisoMatch mounting-plate sets are included.
Product questions
Before you decide
Straight answers to the questions shoppers most often ask about this product.
01How much pitch change does a half-turn make?
A half-turn produces a one-semitone change on every string.
02Are mounting plates included?
Yes. Four sets of brushed-aluminum InvisoMatch mounting plates are included.
Reference
Full specifications
The complete catalog record, organized around the decisions musicians make when comparing gear.
2 detailsPlayability
- String Post Diameter
- 0.236 inch (6mm)
- String Post Length to String Hole
- 0.910” (23mm)
1 detailsBody & build
- Color
- Gold
1 detailsSize & weight
- Peg Holes Diameter Required
- 13/32 inch (10mm)
1 detailsOther
- Gear Ratio
- 39:1, 24:1, 20:1, 14:1, 20:1, 12:1
