Features: Made from aluminum alloy, ensuring stability, durability, and resistance to deformation for long terms use. Precisely true or change the radius of a fingerboard and level frets with ease, allowing for improved playability and performances. Each sanding beam is designed to fit two different radius, providing versatility and efficiency in shaping and leveling guitar and bass fingerboards. Features a protective designs that preventsscratching or damaging the guitar or bass during the fret leveling process. This tool is necessary for shaping radiused fretboards and achieving professional level fretwork. Specifications: Materials: Aluminum alloy Styles: 15CM/20CM/25CM 15CM size: about 15x7.3x2.85cm/5.91x2.87x1.12inch 20CM size: about 20x7.3x2.85cm/7.87x2.87x1.12inch 25CM size: about 25x7.3x2.85cm/9.84x2.87x1.12inch Package Includes: 1pc Fingerboard Sanding Block note: Please allow 1-2cm errors due to manual measurement, make sure that not mind before you order. Due to difference between different monitors, the picture may not reflect the actual color.