Precisely engineered open-gear mandolin machine heads evoke classic style with modern performance.
The Grover professional mandolin vintage A style 409 series tuning machines provide precision tuning for your mandolin. With an 18:1 gear ratio, you can achieve accurate intonation and stable tuning. The open gears in a vintage "worm under" configuration and die-cast plate give an authentic retro look, while the bell-top button screws complete the vintage aesthetics. The 25/64" post hole and overall post length of 30.3 mm ensure a secure fit on most mandolins. Whether you play bluegrass, folk or other genres, the Grover 409 series tuning machines keep your mandolin sounding its best.