1、Made of quality zinc alloy material , anti-rust and anti-oxidation, sturdy and durable. 2、Completely adjustable saddle for harmonics and smooth work roll with locking post and hex key. 3、Smooth surface, will not scratching your guitar. 4、Great accessory for replace wear out, damaged or old guitar bridge tailpieces. 5、Easy to install and use. Suitable for a large range of guitars. Features: Made of quality zinc alloy material , anti-rust and anti-oxidation, sturdy and durable. Completely adjustable saddle for harmonics and smooth work roll with locking post and hex key. Smooth surface, will not scratching your guitar.  Great accessory for replace wear out, damaged or old guitar bridge tailpieces. Easy to install and use. Suitable for a large range of guitars. Specification:  Material:Zinc Alloy+Brass Idler Wheel Size:84*17mm/ 3.31* 0.67in String Interval: 10.1mm/ 0.41in Color:Chrome/Black(Optional) Package List: 1*Bridge 2*Wrench 2*Rotate Knob Note: As different computers display colors differently, the color of the actual item may vary slightly from the above images.