The Graph Tech UN-LOCK Nut replaces traditional locking nuts, no clamps, no tools, no hassle. Use locking tuners, and if you break a string mid-set, swap it fast and keep playing. It’s self-lubricated for smoother tuning and longer string life. Match it with our Ratio Locking Machine Heads — every string has its own gear ratio, so tuning feels consistent across all six. And with InvisoMatch Plates, you can install Ratio Tuners with no drilling and keep your headstock clean. More tone. Less work.