Graph Tech

The PRB-5320 is a right-handed set of RATIO® Calibrated Machine Heads for BASS that use a 3 x 2 configuration. Every string reacts the same to any tuning adjustment. Predictable, precise tuning, on every string. In order to achieve higher gear ratios, Ratio are the world's first machine heads using a double envelope gear design with a hardened steel gear. Amazingly smooth and super strong.

GraphTech balanced the gear ratios to each string simplifying the tuning process. With RATIO®, a half-turn is a semi-tone!

Specifications

From Low B to G - 48:1, 36:1, 30:1, 20:1, 18:1
Gear ratio: unique for each string position - one turn-one tone
Peg holes diameter required: 35/64" (14 mm)
String post diameter: 0.547" (13.9 mm)
String post length to string hole: 1.030" (26.1 mm)
Weight per single machine head: 1.86 oz (53 g)
Weight per set of six: 9.3 oz (265 g)
String diameter up to 0.98 gauge (or larger if taper-wound)

Includes

- 5 machine heads
- Mounting screws
- Bushings