Wide Application: Gear ratio: 1:16. Heavy-duty internal gears are used to effectively prevent the screw from slipping. Universal size head tuner fits almost all acoustic and electric guitars. Premium Quality: Made of zinc alloy material, the guitar tuner pegs have high performance, anti-rust, corrosion resistance, stability and durability. Good Performance: With these tuning pegs, you can tune guitar strings fast and accurately. The locking tuners can prevent the gear from being exposed to air and reduce the rust, which is more durable. Easy to Install: Guitar tuning keys set come with 6 right machine heads and other fixing accessories, which is easy to install. Colour:As shown Material:Metal Package Contents: 6 x right hand guitar machine heads 6 x ferrules 6 x screws 6 x threaded bushings Only the above package content, other products are not included. Note: Light shooting 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.