Achieve rock-solid tuning stability with the elegance of vintage style.
The Grover Professional Mandolin F Style (409 Series) black button tuning machines provide precision tuning for your mandolin. With an 18:1 gear ratio, you'll achieve accurate tuning with minimal effort. The open gears are arranged in a staggered "worm over" configuration, maintaining correct alignment for smooth operation. A die-cast plate and bell-top button screws give these tuners a vintage aesthetic while providing modern performance. Designed for mandolins with a 25/64" post hole, these tuners drop in as a replacement for many stock tuners. Keeping your mandolin in tune is essential and with the Professional Mandolin F Style (409 Series) black button tuning machines you'll stay in tune through an entire performance.