Schaller-patented vintage-style bass tuner. State of the art, highest precision, counterfort-mount. All parts are precision-crafted and surface-finished, the self-locking drive ensures an even, delicate and steady tuning.All string posts are made of high-grade brass and fitted into the housing with utmost precision, ensuring the best possible tuning accuracy and wear resistance. Gear ratio 1:20 3L2R.