---
product_id: 364090648
title: "Jiayouy 4mm & 5mm Ball End Truss Rod Adjustment Wrench for Martin Acoustic Guitar Black"
brand: "jiayouy"
price: "€ 13.18"
currency: EUR
in_stock: true
reviews_count: 5
url: https://www.desertcart.fi/products/364090648-jiayouy-4mm-and-5mm-ball-end-truss-rod-adjustment-wrench
store_origin: FI
region: Finland
---

# L-shape design 4mm & 5mm sizes Durable carbon steel Jiayouy 4mm & 5mm Ball End Truss Rod Adjustment Wrench for Martin Acoustic Guitar Black

**Brand:** jiayouy
**Price:** € 13.18
**Availability:** ✅ In Stock

## Summary

> 🎶 Tune in to perfection with every twist!

## Quick Answers

- **What is this?** Jiayouy 4mm & 5mm Ball End Truss Rod Adjustment Wrench for Martin Acoustic Guitar Black by jiayouy
- **How much does it cost?** € 13.18 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.fi](https://www.desertcart.fi/products/364090648-jiayouy-4mm-and-5mm-ball-end-truss-rod-adjustment-wrench)

## Best For

- jiayouy enthusiasts

## Why This Product

- Trusted jiayouy brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Compact Size:** Measuring 12.5cm x 7.5cm, it's easy to store and carry.
- • **User-Friendly:** Designed for both professionals and hobbyists, ensuring a seamless tuning experience.
- • **Ergonomic Design:** Two-way L-shape allows for effortless adjustments without damaging your instrument.
- • **Precision Engineering:** Crafted from high-quality carbon steel for unmatched durability.
- • **Versatile Compatibility:** Perfectly fits Martin acoustic guitars and adaptable for others.

## Overview

The Jiayouy 4mm & 5mm Ball End Truss Rod Adjustment Wrench is a high-quality tool designed for precise adjustments on Martin acoustic guitars. Made from durable carbon steel, this wrench features a two-way L-shape design that allows for easy access to truss rod adjustments without damaging your instrument. Its compact size makes it a convenient addition to any guitarist's toolkit.

## Description

Jiayouy 4mm & 5mm Ball End Truss Rod Adjustment Wrench for Martin Acoustic Guitar Black

## Features

- Made of carbon steel, durable and highly wear-resistant.
- 4 & 5mm ball end guitar truss rod, Size:12.5cm x 7.5cm.
- For locking hexagonal screws on the bridge, adjusting the guitar neck.
- Two way L-shape truss rod adjusment, 90° Bend no creases, no damage to material.
- Suitable for Martin acoustic guitar, If use it for other brands of guitars. Please confirm the size of truss rod.

## Images

![Jiayouy 4mm & 5mm Ball End Truss Rod Adjustment Wrench for Martin Acoustic Guitar Black - Image 1](https://m.media-amazon.com/images/I/413ZCQ578LS.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ 5.0 out of 5 stars







  
  
    They Fit. They Work.
  

*by D***K on Reviewed in the United States on May 23, 2024*

Sized Right

### ⭐⭐⭐⭐⭐ 5.0 out of 5 stars







  
  
    Perfect fit for Martin LX1
  

*by M***E on Reviewed in the United States on March 20, 2023*

The 5mm Wrench is a perfect fit for my Martin LX1. Its long enough to reach the deeply inset hex and the ball end on the longer side makes it easier to actually get it to engage (my biggest issue!). The length is great and it was very easy to adjust my truss rod using this. I don't actually have any use for the 4mm, but its nice to have.

### ⭐⭐⭐⭐⭐ 5.0 out of 5 stars







  
  
    Just what I needed
  

*by E***. on Reviewed in the United States on August 7, 2022*

I need a longer wrench for my Martin 000 guitar and this is the perfect length/size

---

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**Shop now:** [https://www.desertcart.fi/products/364090648-jiayouy-4mm-and-5mm-ball-end-truss-rod-adjustment-wrench](https://www.desertcart.fi/products/364090648-jiayouy-4mm-and-5mm-ball-end-truss-rod-adjustment-wrench)

---

*Product available on Desertcart Finland*
*Store origin: FI*
*Last updated: 2026-03-08*