For locking hexagonal screws on the bridge, adjusting the guitar neck.
Hex Size : 5mm/0.2"; Overall Size : 125 x 75mm / 4.9" x 2.95".
Extended allen wrench for guitar truss rod, works well for various truss rod adjustments, like those needed for martin guitar. The increased length simplifies the process of adjusting the truss rod.
Two way L-shape truss rod adjustment tool, easy to insert the sound hole and adjust the neck.
Suitable for most kinds of acoustic guitar, electric guitar and bass.