Precision engineered machine heads offer ultra-smooth and stable tuning.
The Grover Super Rotomatics 109-18 series tuning machines provide precision tuning for your instrument. With an 18:1 gear ratio, you'll achieve smooth, stable tuning that holds pitch. The sealed gearbox protects the lubricated gears for a lifetime of reliable performance. The 25/64" post hole and 28.2 mm post length accommodate most strings. Replace your existing tuners with the drop-in compatible 109-18 series for fast installation and upgraded performance. Experience the difference in tuning feel and accuracy that comes with gear ratios and design optimized for serious musicians.