When it comes to changing guitar strings efficiency is key. So this dunlop guitar string winder tool is designed to remove the hassle and the reduce the consuming time of changing your strings. And its perfect for both acoustic and electric guitars. It accommodates almost any set of machineheads making it a must have accessory for all guitarists.keep it in your gig bag and youre always prepared from the rehearsal room to the studio to the stage. As this dunlop string winder makes changing your strings one smooth sailing experience. All courtesy of its larger precision moulded handle and robust stable rotation. And it also features a built in bridge pin puller specifically for your acoustic guitar. So you never worry about stubborn bridge pins again. Less time restringing more time playing.