Graph Tech PRB-5320-B0 5-String 3+2 Bass Ratio Y-Style Button Machine Heads - Black

RATIO® patented gear technology
RATIO® - Calibrated Machine Heads incorporate different string gauges into the tuning equation.

From Low B to G - 48:1, 36:1, 30:1, 20:1, 18:1.

We balanced the gear ratios to each string simplifying the tuning process.

With RATIO®, a half-turn is a semi-tone!

Every string reacts the same to any tuning adjustment. Predictable, precise tuning, on every string.

• Gear ratio: unique for each string position - one turn-one tone
• Peg holes diameter required: 35/64" (14mm)
• String post diameter: 0.547" (13.9mm)
• String post length to string hole: 1.030” (26.1mm)
• Weight per single machine head: 1.86oz (53g)
• String diameter up to 0.98 gauge (or larger if taper-wound)
• Includes 5 machine heads, mounting screws, and bushings