Aluminum Construction:Machined from high-quality aluminum alloy, ensuring stability, durability, and resistance to deformation for long-lasting use. Accurate Fret Leveling: Precisely true or change the radius of a fingerboard and level frets with ease, allowing for improved playability and performance. Innovative Design: Each sanding beam is designed to match two different radii, providing versatility and efficiency in shaping and leveling guitar and bass fingerboards. Scratch Protection: This sanding block features a protective design that preventsscratching or damaging the guitar or bass during the fret leveling process. DIY Essential: For guitarists and luthiers, this tool is a must-have for shaping radiused fretboards and achieving professional-level fretwork. Part Name:Two-way Sanding Block Compatible with guitar & bass fingerboards radian variations:A:7.5inch-15inch/B:12inch-16inch/C:9.5inch-20inch/D:10inch-14inch Colour:Silver Material:Aluminum Alloy Package Contents: 1 x Two-Way Radius Sanding Block Only the above package content, other products are not included. Note: Light reflection 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.