1Contents of Kit: There are 2 string tuning keys and 8 screws in our string tuning key kit, so you can do it conveniently to put into the guitar repair work. 2Rust and Corrosion Proof: The string tuning keys are made of metal, rust proof, corrosion proof, high performance, stable and durable. 3Perfect Fit: Our string tuning keys are suitable for classic guitars and can be perfectly fit, which is an ideal replacement part for your guitar. 4Description of Function: Guitar string tuning keys can help you tune quickly and accurately, not easy to go out of tune. It makes you more comfortable to use. 5Fine Appearance: Guitar string tuning keys are very easy to install and have a perfect appearance, you just need to screw them firmly into the locking position.