This set of acoustic guitar machine heads, mainly adjust the melody of the guitar strings.The tuned acoustic guitar string does not loosen easily.With these tuning pegs, you can adjust guitar strings fast and accurately.High quality internal gear, it is effective to prevent screw slipping.These tuning pegs are compatible with the acoustic guitar and good rust prevention.Diameter: Approx.6mm / 0.23inColour: black + silverMaterial: plastic + metalPackage Contents:6 * Guitar Tuning PegsOnly the above package content, other products are not included.Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.