Item #1584928 Model #PRB-4400-B0

Graph Tech Ratio 4-In-Line Bass Y-Style Button Black 4 String


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Graph Tech Ratio 4-In-Line Bass Y-Style Button calibrated machine heads incorporate different string gauges into the tuning equation. The Graph Tech PRB-4400 is a right-handed set of Ratio calibrated machine heads for bass guitars that use a 4-in-line configuration. Every string reacts the same to any tuning adjustment, delivering predictable, precise tuning, on every string. With ratio, a half turn is a semi-tone. Graph Tech Ratio tuners use a double envelope gear design with a hardened steel gear that makes them amazingly smooth and super strong.
  • Gear ratio: 36:1, 30:1, 20:1, 18:1
  • Peg holes diameter required: 35/64" (14mm)
  • String post diameter: 0.547" (13.9mm)
  • String post length to string hole: 1.030" (26.1mm)
  • String diameter up to 0.98 gauge (or larger if taper-wound)


  • Includes:
  • 4 machine heads
  • Mounting screws
  • Bushings