Guitar Wrench, 2 Pcs Metal Wrench Tool 4mm / 5mm Ball End for Martin Acoustic Guitar(5mm Silver)

Durable Material: The wrench is made of steel material, which is super sturdy and durable ,not easy to break. L-shape truss rod: The guitar wrench tool is convenient to insert the sound hole and adjust the neck. Easy to use:There are grooves on the end of the handshake for easy application of force, can also install handle for the wrench. Adjust the guitar neck straigh: Designed to the adjusting hole of the guitar neck relatively deep, whih is suitable for Martin guitar. Gauge: 4.0mm, 5.0mm, various gauges for you adjusting truss rod efficiently.