Graph Tech Ratio 2x2 4-String Bass Tuners, Y-Key - BLACK, PRB-4220-B0

Graph Tech PRB-4220-B0 Ratio Bass, Set Of Machine Heads For Electric Basses, Configuration: 4 pieces; 2 x left, 2 x right, Enclosed construction, Each machine head has its own transmission ratio calibrated for the respective string, One full turn of any machine head results in a complete pitch change (+ / -), Gear ratio per string: E - 36:1, A - 30:1, D - 20:1, G - 18:1, Shaft diameter without mounting sleeve: 8.9 mm, Mounting diameter with mounting sleeve: 13.9 mm, Weight per machine head: approx. 52.62 g, Y-Style Contemporary tuning knobs, Finish: Black