Changing strings just got a lot easier, safer, and more fun. This patent pending GRIP Bit peg winder attaches to any cordless power drill or power screwdriver. The rubber-lined head smoothly and silently slips over your tuning pegs for scratch-free and clank-free operation, and the carbon steel shaft won't wear out anytime soon. Fits virtually all tuning pegs both big and small, and the narrow profile doesn't hit adjacent tuning pegs — especially important on 12-string and electric guitars. Perfect for guitar, bass, banjo, mandolin, ukulele and orchestral instruments.