Graph Tech 4-In-Line Ratio Open Back Clover Leaf Button Bass Tuners - CHROME. RATIO® patented gear technology RATIO® - Calibrated Machine Heads incorporate different string gauges into the tuning equation.
From Low E to G - 48:1, 36:1, 25:1, and 23:1. 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. Gear ratio: unique for each string position - one turn-one tone Peg holes diameter required: 0.720" (18mm) String post diameter: 0.547" (13.9mm) String post length to string hole: 0.807 (20.5mm) Weight per single machine head: 3.5oz (99.3g) Weight per set of four: 14oz (397g) String diameter up to 130 gauge Includes 4 machine heads, mounting screws and bushings.