Description:This set of acoustic guitar keys, mainly customize the melody of the guitar strings. A tuned acoustic guitar string won't come loose easily. With these tuning pegs, you can tune your guitar strings quickly and accurately. The high-quality internal gear effectively prevents the screw from slipping. These tuning pegs are compatible with acoustic guitar and good rust prevention. Specification:Material: Iron Diameter: Approx. 6mm/0.23 inchPackage Included:6pcs 3L3R Acoustic Guitar TunersNote:Please allow 1-3mm measurement deviation due to manual measurement. Due to the different monitor and light effect, the actual color of the item may be slightly different from the color showed on the pictures.