Guitar Truss Rod Wrench, 4mm and 5mm Allen Wrench, Extended Ball Head Hex Key for Adjusting Guitar Necks, Guitar Tools Suitable for Martin Acoustic Guitar (4mm & 5mm(black))
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.
For locking hexagonal screws on the bridge, adjusting the guitar neck.
Two way L-shape truss rod adjustment tool, easy to insert the sound hole and adjust the neck.
Hex Size : 4mm/0.16", 5mm/0.2"; Overall Size : 125 x 75mm / 4.9" x 2.95".
Suitable for most kinds of acoustic guitar, electric guitar and bass.