Ernie Balls all in one tool kit is perfect for cleaning, maintaining and keeping your instrument in perfect playing condition. Change strings, set intonation, adjust the action, check string height and more. Tool kit includes Microfiber Polish Cloth, Wonder Wipes, Heavy Duty String Cutter, Peg Winder, 6-in-1 Screwdriver, Ruler, and durable Hex Wrench Set.