Premium Truss Rod 4mm (MN237)

This is a guitar bridge key designed for Martin DSS, OMSS, Modern Deluxe Series, and SC-13E models. It is also compatible with other acoustic guitars requiring a 4 mm saddle key. The ergonomic handle provides better reach and control.

• This is compatible with Martin models using a 5 mm size and other brands needing a 4 mm saddle key.