Threshold Leveling Guitar Luthier Tool For Acoustic Bass Guitar CNC 457mm Description: [Guitar Fret Leveling Sanding Beam] Aluminum Fingerboard Aligner is a tool for guitarists and luthiers, allowing you to perfectly level the frets without removing the strings. [STURDY MATERIAL] Guitar fingerboard grinding tool made of high quality aluminum, which is CNC machined and subjected to an excellent oxidized sandblasting process, ensuring durability and resistance to deformation. [MULTIPLE USES] Guitar grinding block suitable for grinding electric guitar, acoustic guitar, electric bass, banjo, mandolin and other string instruments. Perfect for leveling frets, fingerboards, and fret crowns, making it a versatile accessory for performers and luthiers alike. [file bar] The length of 4,5 inches (114 mm) is ideal for point leveling of frets all over the neck. It is also great for creating backing tracks on an acoustic guitar. 9" long (228 mm) designed for smaller necks such as ukuleles and mandolins. It is also suitable for diatonic neck leveling and spot leveling. The 18" (457 mm) length allows for easy leveling of the entire neck. [Precise Design]The guitar's precise leveling surface works quickly and accurately with open or closed strings, so your threshold stays level. Each leveling task gets its own file bar. Size Chart: 11,4 cm x 3,8 cm/4,49 inch x 1,50 inch 22,8 cm x 3,8 cm/8,98 inch x 1,50 inch 35 cm x 3,8 cm/13,78 inch x 1,50 inch 45,7 cm x 3,8 cm/17,99 inch x 1,50 inch The package includes: 1 aluminum pull-up leveling rod (optional size) Note: