Aircraft-grade aluminum capodastro, for 6- and 12-string acoustic and electric guitars, ensures in-tune, buzz-free performance at any fret, patented micrometric adjustment mechanism allows you to dial in the exact tension to hit clear notes without excessive force at any neck position, reduces the need to re-tune the guitar during and after capoing, stands up to the harshest playing times, adds very little additional weight or obstruction to the instrument.