Graph Tech PRL-9721-C0, Locking Machine Head Set for Electric Guitar, 6 Pieces, Style: 6-in-Line, Bass side/right hand, Staggered post design, String gauges were 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, Contemporary buttons, Closed construction, 2-Pin assembly, Mounting hole diameter: 9.7 mm, Shaft diameter: 6 mm, Gear ratio: E - 12:1, B - 20:1, G - 35:1, D - 20:1, A - 24:1, E - 39:1, Surface: Chrome, InvisoMatch standard mounting plates included for using existing screw holes