Back to Shop Truss Rod WrenchMSRP -$5.00 USD 4mm truss rod allen wrench. Sizes Choose an option4mm Clear Quantity Add to cart You May Like Silver Tuning Machines $35.00 USD – $70.00 USD Córdoba Polishing Cloth $9.99 USD Córdoba Clip-On Tuner $13.99 USD Pearloid Ukulele Tuners $5.00 USD – $20.00 USD