Grover's mandolin machines feature 18:1 micro tuning, die-cast baseplates for stability, and black knob shafts with removable pearlescent plastic knobs. Standard 29/32" string post spacing; screws and knurled press-fit string post bushings are included. 11/32"-diameter pegholes required.
See details below
Worm gears are positioned below the string posts (turn the knob counterclockwise to tighten the string).
To be sure these tuners fit your instrument, compare your existing machines and peghole dimensions to our listed specs to help determine the best replacement.