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

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.