Detail 01
Steel construction
The wrench is built in steel for regular use.

Independent shopping perspective
Martin's black truss-rod wrench is identified as a 4 mm tool, with a steel body, ergonomic handle, and precision ball end. It is made for controlled, small truss-rod adjustments during instrument maintenance and setup work. The rounded tip and comfortable grip focus the tool on making those adjustments more manageable rather than adding unnecessary complexity to the job.

Strong match
What matters in use
Catalog numbers tell only part of the story. These are the details most likely to change how this product feels, sounds, or fits into a setup.
Detail 01
The wrench is built in steel for regular use.
Detail 02
The handle is designed for comfortable adjustment work.
Final check
Product questions
Straight answers to the questions shoppers most often ask about this product.
Black.
It has steel construction.
It is intended for truss-rod adjustment during instrument maintenance and setup.
Reference
The complete catalog record, organized around the decisions musicians make when comparing gear.