CruzTOOLS Groove Tech Sound Hole Truss Rod Wrench - 4mm

Acoustic guitar truss rods need adjustment just like electrics, but manufacturers sure don't make it easy. Access is typically through the sound hole, and the nut may be one or two braces away. Our new Sound Hole Drivers allow access to nuts on most makes and models of acoustics, with a precision ball-end tip for easy fit, extra length on both segments of the blade, and an oversized handle for confidence when making adjustments. Professional-grade

4mm - fits most brands