The concept behind locking tuners is very simple: a little clamp inside the tuning posts grabs your string and keeps it from becoming loose, and you can tighten it with a little knob on the back. Relax the thumb screw, insert string through the post hole, just need wrap around once, lock by tightening with the thumb screw, everything is touch fine. The locking device also save many troubles caused by tremolo system, stop string's sliding effectly, It works well. Many guitar manufacturers have begun to apply this machine head to their new guitars. Package Contents: Locking Guitar Tuning Pegs x 6(3 Per Side)
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