The ergonomic design makes string changes easier than ever before with it's built-in clippers, bridge pin puller, and peg winder all rolled into one product.the peg winder is also designed to fit on virtually all guitars, banjos, and mandolins, truly making it a must have for every instrument case.also for bass guitar. With a handle designed for efficient and comfortable use and a peg winder that fits both vintage and modern basses.the hardened steel clippers are also tough enough to cut through bass strings with ease.