Creanoso Guitar Truss Rod Allen Wrench Adjustment Tool for Martin Acoustic Guitars
[Product Information]
To adjust the truss rod on Martin Guitars and most acoustic guitar
5mm ball end guitar truss rod. Dimension: 2.95" x 4.92"
Bonus: Creanoso Guitar Pick
Counter-clockwise on the nut always gives you some relief. Clockwise removes relief. Do your adjustment a little at a time with the guitar tuned up to pitch.