Ball bearing truss rod wrench for guitar tuning (4mm wrench)

【Deep Access】The extended shaft and slim profile reach deep truss rod cavities that standard wrenches miss. For guitarists and luthiers, this tool ensures precise neck straightening and smooth action adjustment through the soundhole and tight spaces. 【Anti-Loosening Ball Head】The reinforced ball head provides maximum torque while preventing damage to truss rod heads. For setting up electric and acoustic guitars, this tool maintains a firm grip at the correct angle, allowing for confident adjustments without damaging the instrument. 【Easy Soundhole Access】The L-shaped body and slim ball head allow for one-handed control through the soundhole and narrow neck cavities. Ideal for adjusting acoustic and electric guitars, this hex key makes every step smoother, from straightening a bowed neck to lowering the string height. 【Professional Craftsmanship】Precision-machined from a high-quality metal alloy, this guitar maintenance tool is designed for discerning luthiers and musicians. The robust construction ensures a reliable grip and torque for years of service on your favorite guitars. 【Comfortable Grip】The textured rubberized grip and balanced weight distribution reduce hand fatigue during extended adjustment sessions. Whether you're a touring musician making quick adjustments on stage or a home player correcting a bowed neck, every turn remains precise and comfortable.