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The open backs are a right handed set of open back Ratio Calibrated Machine Heads for Acoustic guitars that use three per side tuners. It has a choice of an intricate skeletonized button or a classic butterbean button
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Machine heads for acoustic guitar
6 pcs. for 3+3 orientation
incorporate string gauges in tuning equation
half turn equals half tone on each string
faster and more accurate tuning of each string
skeleton tuning pegs
closed back
2-pin mounting
mounting hole diameter 6 mm
post diameter 6 mm
gear ratiosE - 12:1, B - 20:1, G - 14:1, D - 20:1, A - 24:1, E - 39:1
nickel
only suitable for use on righthand instruments - gear ratios will not match strings on lefthand instruments