Graph Tech Ratio 2+2 4-String Bass Tuners, Y-Style Key - Chrome

Fast, Precise Tuning

The PRB-4220 is a right-handed set of RATIO® Calibrated Machine Heads for bass that use a 2 x 2 configuration.

Features

• Gear ratio per string: E - 36:1, A - 30:1, D - 20:1, G - 18:1
• One half-turn results in a semi-tone change in pitch for every string, giving predictable, precise tuning.
• Includes 4 machine heads, mounting screws, and bushings

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: 1.86oz (53g)
Weight per set of four: 7.44oz (212g)
String diameter up to 0.98 gauge (or larger if taper-wound)