---
product_id: 424642051
title: "Frautron 4mm Guitar Truss Rod Wrench, Guitar Allen Wrench Tool for Martin Acoustic Guitar Truss Rod Adjustment, Deep or Narrow Truss Adjustment"
brand: "frautron"
price: "€ 49.04"
currency: EUR
in_stock: true
reviews_count: 4
url: https://www.desertcart.hr/products/424642051-frautron-4mm-guitar-truss-rod-wrench-guitar-allen-wrench-tool
store_origin: HR
region: Croatia
---

# Carbon Steel Build 4mm Hex Size L-Shape Design Frautron 4mm Guitar Truss Rod Wrench, Guitar Allen Wrench Tool for Martin Acoustic Guitar Truss Rod Adjustment, Deep or Narrow Truss Adjustment

**Brand:** frautron
**Price:** € 49.04
**Availability:** ✅ In Stock

## Summary

> 🎸 Tune Up Your Game with Precision!

## Quick Answers

- **What is this?** Frautron 4mm Guitar Truss Rod Wrench, Guitar Allen Wrench Tool for Martin Acoustic Guitar Truss Rod Adjustment, Deep or Narrow Truss Adjustment by frautron
- **How much does it cost?** € 49.04 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.hr](https://www.desertcart.hr/products/424642051-frautron-4mm-guitar-truss-rod-wrench-guitar-allen-wrench-tool)

## Best For

- frautron enthusiasts

## Why This Product

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

## Key Features

- • **Durable Construction:** Crafted from high-quality carbon steel for long-lasting performance.
- • **User-Friendly Design:** L-shaped tool easily fits into sound holes for quick adjustments.
- • **Compact & Lightweight:** Weighing only 23g, it's the perfect portable companion for any musician.
- • **Effortless Adjustments:** Experience seamless neck adjustments with the extended 4mm length.
- • **Versatile Compatibility:** Perfectly designed for Martin guitars and most acoustic, electric guitars, and basses.

## Overview

The Frautron 4mm Guitar Truss Rod Wrench is a specialized tool designed for easy adjustments of narrow or deep truss rods, particularly in Martin acoustic guitars. Made from durable carbon steel, this lightweight and compact wrench features a user-friendly L-shape design, making it an essential accessory for guitarists seeking optimal neck performance.

## Description

Frautron 4mm Guitar Truss Rod Wrench, Guitar Allen Wrench Tool for Martin Acoustic Guitar Truss Rod Adjustment, Deep or Narrow Truss Adjustment

## Features

- 4mm lengthened guitar truss rod allen wrench, suitable for narrow or deep truss rod adjustments such as martin guitar. The added length really makes adjusting the truss rod easy.
- Two way L-shape truss rod adjustment tool, easy to insert the sound hole and adjust the neck.
- Made of carbon steel material, sturdy, durable and wear-resistant.
- Hex Size : 4mm/0.16"; Overall Size : 125 x 75mm / 4.9" x 2.95".
- Suitable for most kinds of acoustic guitar, electric guitar and bass.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| Manufacturer | Frautron |
| Part number | SJTG-SJT-BR#-TOOLPC-210722-B09V38H8VC |
| Item Weight | 23 g |
| Package Dimensions | 17.7 x 9.7 x 0.6 cm; 23 g |
| Item model number | SJTG-SJT-BR#-TOOLPC-210722-B09V38H8VC |
| Size | 4mm |
| Item Package Quantity | 1 |

## Images

![Frautron 4mm Guitar Truss Rod Wrench, Guitar Allen Wrench Tool for Martin Acoustic Guitar Truss Rod Adjustment, Deep or Narrow Truss Adjustment - Image 1](https://m.media-amazon.com/images/I/412oXv51KbL.jpg)
![Frautron 4mm Guitar Truss Rod Wrench, Guitar Allen Wrench Tool for Martin Acoustic Guitar Truss Rod Adjustment, Deep or Narrow Truss Adjustment - Image 2](https://m.media-amazon.com/images/I/514Sd0DEl+L.jpg)
![Frautron 4mm Guitar Truss Rod Wrench, Guitar Allen Wrench Tool for Martin Acoustic Guitar Truss Rod Adjustment, Deep or Narrow Truss Adjustment - Image 3](https://m.media-amazon.com/images/I/71OdeCVqmVL.jpg)

## Available Options

This product comes in different **Size** options.

## Customer Reviews

### ⭐⭐⭐⭐⭐ 







  
  
    Handy
  

*by J***T on Reviewed in the United States on 7 April 2023*

For adjusting the truss rod on an instrument with a 4mm hex-head nut, this tool is great. It makes getting to those truss rod nuts that are deep down inside neck a breeze and provides plenty of leverage for turning it. Use that leverage carefully, though. Bow the neck manually as you adjust the truss rod so as to not snap it. With this tool, that could be a possibility, but I love how it makes accessibility so much easier.

### ⭐⭐⭐⭐⭐ 







  
  
    Exactly what I needed
  

*by W***O on Reviewed in the United States on 12 December 2022*

Nothing to dislike. This is the tool I needed to adjust the truss rod on my new martin guitar

### ⭐ 







  
  
    DO NOT BUY THIS WRENCH UNLESS YOU HATE YOUR GUITAR
  

*by P***O on Reviewed in the United States on 15 December 2022*

This wrench is advertised as being 4mm, but it is NOT! It is slightly smaller than 4mm. What this means is that while it will fit into the 4mm nut at the end of your guitar's truss rod, it will not fit tightly. You can feel the "slop" when you rotate the wrench, as it will wiggle slightly within the nut. The flat interior sides of the hex nut will be engaged, not by the flat exterior sides of the wrench, but by the exterior corners of the hex wrench.  You can probably turn a loose nut with it, but if the truss rod nut is tight, and most are due to the tension on the truss rod, those corners will dig into the sides of the nut and very quickly strip it so that the truss rod can never be adjusted again. Using this wrench will result in your guitar requiring an extremely expensive repair!

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**Shop now:** [https://www.desertcart.hr/products/424642051-frautron-4mm-guitar-truss-rod-wrench-guitar-allen-wrench-tool](https://www.desertcart.hr/products/424642051-frautron-4mm-guitar-truss-rod-wrench-guitar-allen-wrench-tool)

---

*Product available on Desertcart Croatia*
*Store origin: HR*
*Last updated: 2026-03-03*