Features: 1.LOCKING HEAD: These guitar tuners are equipped with locking head, which ensures that the strings are securely locked, prevents out of tune, and provides stable pitch performance. 2.GOOD STABILITY: These guitar locking tuners have better tonal stability and can maintain accurate intonation even with frequent string bending or the use of vibrato technology. 3.EASY REPLACEMENT: The locking head design makes guitar string easier to replace, reducing the hassle of winding, allowing you to quickly change strings and maintain sound. 4.EXCELLENT METAL: These guitar locking heads are made of excellent metal, with high hardness, wear resistance and corrosion resistance to ensure their durability and reliability. 5.S: Includes 6pcs guitar tuners, 3 left and 3 right hand design to meet different usage needs, perfect for guitarist or beginner to enhance playing skills and tone stability. specification:Item Type: Guitar Locking Tuner Material: Metal PackageList:6 x Locking Tuner 6 x Nuts 6 x Gaskets 6 x Screws