The Cruztool GrooveTech Guitar/Bass Multi-Tool for guitars and basses stands out in that it is actually useful: no unnecessary gimmicks. Whether you have a USA or imported axe, we've got you covered for most bridge, truss rod, and other adjustments. Includes four metric and three fractional hex keys, two Phillips screwdrivers, a 2.5mm slotted screwdriver, and ruler for setting action. Truss rod sizes are ball-end for easy access. All keys are pro-grade, using heat-treated S2 material with a polishedchrome finish.