Graph Tech 4 String 2+2 Bass Ratio Y-Style Button - Black

The PRB-4220 is a right-handed set of RATIO® Calibrated Machine Heads for BASS that use 2 x 2 configuration. In order to achieve the higher gear ratio's, Ratio's are the world's first machine heads using a double envelope gear design with a hardened steel gear. Amazingly smooth and super strong.

Specifications
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: 1.86 oz (53g)
Weight per set of four: 7.44 oz (212g)
String diameter up to 98 gauge
Includes 4 machine heads, mounting screws and bushings