GrooveTech GTAW4 Soundhole Wrench, 4mm Overview
The CruzTOOLS Groovetech Soundhole Wrench makes it easy to adjust the truss rod of acoustic guitars thanks to its extended hex blade. No more sticking your arm right inside your acoustic only to drop your allen key! Available in 4mm (GTAW4) and 5mm (GTAW5) sizes.