Bass players may know a little about truss rods and action, but few actually attempt adjustment. The Groove Tech kit provides everything you need to work on your axe and an Easy Setup Guide is included to take the mystery out of it. Tools are professional grade and lifetime guaranteed. Hex keys are color-coded gold for metric and black for fractional with ball-ends on truss rod sizes. There's a compartment behind the tools to store spare strings, your owner's manual and Set Up Guide plus a pocket to store picks. Also included is a thickness gauge, ruler, cutters, string winder, 6-in-1 screwdriver and LED flashlight.