The GrooveTech kit provides everything you need to work on your guitar, plus an Easy Setup Guide that takes the mystery out of the process. Eleven hex wrenches are color-coded gold for metric and black for inch sizes, and long pattern for easy access. All truss rod sizes are ball end. Also included is a thickness gauge, ruler, capo, GrooveTech String Cutters, string winder, and 6-in-1 screwdriver. Tools are lifetime guaranteed and pro-grade.