- Graph Tech PRL-9731-B0 Black; locking machine heads for electric guitar, right-hand set, closed construction, staggered posts (eliminates the need for a string tree), each machine head has its own gear ratio, calibrated for the respective string, half turn of any key is a semi-tone pitch change for each string, faster and more accurate tuning of each string, thumb wheel screw on the back to lock the strings, ratio: E - 12:1, B - 20:1, G - 35:1, D - 20:1, A - 24:1, E - 39:1, 6 pieces: 6-in-Line, bass side (left), 2-pin mounting, axis diameter without mounting sleeve: 6.0 mm (0.234"), mounting diameter with mounting sleeve: 10 mm (0.394"), incl. 4 sets of InvisoMatch standard mounting plates for use of existing screw holes, weight ca. 37.5 g / 0.083 lbs (single), Classic button, black finish
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