Graph Tech PRL-8341-B0, Machine Head Set for Electric Guitar, Style: 3 + 3, String gauges are considered in gear ratio, Half a turn corresponds to 1 semitone per string, Faster, more accurate tuning of each string, Locking screw on the back for clamping the string, Vintage button, Closed construction, 2-Pin assembly, Mounting hole diameter: 9.7 mm, Shaft diameter: 6 mm, Colour: Black, InvisoMatch standard mounting plates included for using existing screw holes@+*Gear ratios:*@+@+, E - 12:1, B - 20:1, G - 35:1, D - 20:1, A - 24:1, E - 39:1