GroverProfessional Mandolin A Style 409 Series Pearloid Button Tuning Machines Nickel

The Grover (409 Series) professional mandolin machine heads are designed for serious musicians looking to keep their instrument in tune. Their specially engineered, adjustable worm gear and die-cast plate maintain the center lines of the gear and worm to ensure correct alignment for precision tuning. The 18:1 gear ratio provides ultrafine-tuning tuning control, allowing you to dial in the perfect pitch. The bell-top button screws give these machine heads a vintage aesthetic while the open-gears in a modern "worm over" configuration make tuning quick and easy.