Detail 01
18:1 gear ratio
Provides the stated minute tuning-adjustment control.
Product detailSKU #1500000429793
GroverProfessional Mandolin F Style 409 Series White Button Tuning Machines Chrome
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Independent shopping perspective
The Korena take
The F-style 409 Series white-button set is a chrome mandolin tuning-machine option with open worm-over gears and an 18:1 ratio for minute tuning adjustments. Its 25/64-inch post holes and 30.3 mm overall post length are part of the setup dimensions, with mounting screws included for installation. Bell-top button screws add a vintage detail alongside the modern open-gear appearance. The stated setup flexibility extends to string-gauge selection, while the ratio is intended to support precise intonation work.
Strong match
Who this is for
- F-style mandolin setup work requiring 25/64-inch post holes and a 30.3 mm overall post length.
- Fine tuning adjustments where the 18:1 ratio is used for precise intonation.
Consider the trade-offs
When to look elsewhere
- Mandolins without 25/64-inch post holes.
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
30.3 mm overall post length
This dimension is identified as providing flexibility in string-gauge selection.
Final check
Know before you order
- 01Confirm the 25/64-inch post-hole requirement and the 30.3 mm overall post length for your setup.
- 02Mounting screws are included.
Product questions
Before you decide
Straight answers to the questions shoppers most often ask about this product.
01Are mounting screws included?
Yes. Hardware is included in the form of mounting screws.
02What are the post dimensions?
The post holes are 25/64 inch, and the overall post length is 30.3 mm.
Reference
Full specifications
The complete catalog record, organized around the decisions musicians make when comparing gear.
1 detailsBody & build
- Color
- White
