The PRB-5320 is a right-handed set of RATIO® Calibrated Machine Heads for BASS that use a 3 x 2 configuration. 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. Features RATIO® patented gear technologyRATIO® - 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. Specs 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) Weight per set of six: 9.3oz (265g) String diameter up to 0.98 gauge (or larger if taper-wound) Includes 5 machine heads, mounting screws, and bushings
