This product is specially designed for guitar. It is an ideal tool for maintenance or DIY. Made of quality plastic and metal material, this product is sturdy, anti-rust and durable for long term use. Features: Made of quality plastic and metal material, this product is sturdy, anti-rust and durable for long term use. Special design making it easy to measure the radius from either above or below the strings. Help accurately set up your guitar bridge saddles to match the fingerboard radius. Lightweight and small size, easy to carry. And it comes with 9 guitar radius gauges and 1 tail nail opener. Suitable for guitar and guitar bass lovers, ideal tools for maintenance or DIY. Specification: Material: Plastic + Metal Colour: Silver Size: Approx. 5.5 * 7 cm / 2.2 * 2.8 inch Weight: Approx. 57 g / 2.0 oz Package List: 9 * Guitar Radius Gauges 1 * Tail Nail Opener 1、Made of quality plastic and metal material, this product is sturdy, anti-rust and durable for long term use. 2、Special design making it easy to measure the radius from either above or below the strings. 3、Help accurately set up your guitar bridge saddles to match the fingerboard radius. 4、Lightweight and small size, easy to carry. And it comes with 9 guitar radius gauges? and 1 tail nail opener?. 5、Suitable for guitar and guitar bass lovers, ideal tools for maintenance or DIY.