Music Nomad MN237 Premium Truss Rod Wrench - 4mm

Not all truss rod tools are created equal—and when you're reaching deep into the soundhole of your prized acoustic guitar, you'd better believe it matters. The MusicNomad MN237 Premium Truss Rod Wrench is built for those who demand precision, durability, and a touch of class in their maintenance toolkit. This 4mm wrench is purpose-made for soundhole access and is a favourite among players of select MARTIN® models, including the DSS, OMSS, SC-13E, and the Modern Deluxe Series. But it doesn't stop there—it’s compatible with any acoustic guitar that calls for a 4mm truss rod adjustment from within the soundhole.

Beautifully crafted from high-quality steel and finished with sleek black nickel, this wrench feels as solid as it looks. The extra-long 4.75-inch arm with a ball-end tip ensures you can reach the truss rod nut without fumbling around, while the ergonomic handle provides both comfort and control—so you can fine-tune neck relief with confidence, not contortion.

With laser-etched size markings, there's no mistaking this tool in your kit. It's a practical, pro-grade piece of gear that brings finesse to your setups—perfect for home players and touring techs alike. At Musicmaker, where we've been helping musicians care for their instruments since the early '80s, we know a good tool when we see one—and the MN237 gets our nod of approval.

Features

• Tailored for acoustic guitars requiring 4mm truss rod adjustments via the soundhole, including select MARTIN® models (DSS, OMSS, SC-13E, Modern Deluxe Series)

• Solid steel construction with a premium black nickel finish for enhanced durability and sleek aesthetics

• Ball-end design on a 4.75-inch arm offers easy access and smooth manoeuvring in tight spaces

• Ergonomic handle delivers a secure, comfortable grip for controlled adjustments

• Laser-etched 4mm size marking for quick, no-guesswork identification