Makes tricky tremolo spring installation easy. A word of advice: pliers are NOT the right tool for installing tremolo springs! Pliers slip and the spring goes flying off to ding the guitar's finish or scrape your knuckles. Here's a better way: a simple, inexpensive 6" steel hook that's the right length to make stubborn spring installation remarkably easy. It gives you a straight non-slip pull—you'll wonder how you got along without it! It helps protect your fingers as well as your guitar.