GROVER Professional Mandolin A Style 409 Series Black Button Tuning Machines Gold

The Grover Professional mandolin A Style (409 Series) black button tuning machines provide you with precision tuning for your mandolin. Specially engineered adjustable worm gears and die-cast plates maintain the center lines of the gear and worm, ensuring correct alignment for tuning accuracy. Open gears in a modern "worm over" configuration give these tuners a vintage look, while an 18:1 gear ratio provides smooth, stable tuning. With a 25/64" post hole and hardware included, these tuners drop in to replace your existing tuners for an upgrade in performance and aesthetics. For mandolinists looking to improve their instrument's tuning stability and vintage-inspired style, the Professional mandolin A Style (409 Series) black button tuning machines deliver precision performance and timeless looks.