1、1:18 Transmission Ratio: This guitar machine heads tuning key peg features a 1:18 transmission ratio, which makes it very reliable to use and makes adjustments easy, stable and accurate. 2、Easy To Install: This acoustic guitar tuning peg is easy to install without complicated operations and tools, perfect for replacing old and dirty tuning pegs, great for guitar tuning. 3、Compact And Lightweight: This guitar string tuning key is small in size and light in weight, which makes it very convenient to carry around with you and use, and easy to install and replace. 4、Sturdy And Endurable: This guitar tuning peg is made of excellent quality metal and plastic materials, sturdy and abrasion resistant, anti rust, anti erosion, good stability performance and durability. 5、Wide Application: This metal tuner machine heads knob has a wide range of applications and can be used for stage performances, daily practice, music recording and so on.