The Cruz Tool Groove Tech is an essential bit of kit for any guitar or bass player. The 10 different tools in one will fit almost every kind of bridge & truss rod size out there.The first multi-tool for guitars and basses that's actually useful, without 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 polished chrome finish.