Features: String Winders suitable for tunings machines to easily & quickly change strings with a crank style motion. Make of ABS and metal materials, Light weight, sturdys and durability. Essential guitar repair tool for guitarists. The guitar pegs Winders fit onto the guitar tunings pegs and rotates to help wind the guitar strings making a quicker string change for your guitar. For loosening and tightening strings of acoustics/ electric guitar. A great assistant tool for luthier or guitar player. Works with electric, acoustics & nylon guitar. Specifications: Materials: ABS Color: Black/Purple/Pinks/Blue Size: As shown in the picture Package Includes: 1x Guitar String Winders Tool note: Please allow 1-2cm errors due to manual measurement, make sure that you not mind before you order. Due to the difference between different monitors, the picture may not reflect the actual color of the item.