The revolutionary new tool fretbar understring leveler lets you level your frets under full tension without removing the strings. You can level your frets with the strings ON.Material: Aluminum - CNC machined. High glossiness, durable and long-lasting use, not easy to deform.Cuboid shape. Dimensions:Convenient luthier sanding leveler file.Applicable for fret, saddle, and fingerboard sanding, great accessory for players and luthiers. Suitable for the fret leveling of electric guitar, acoustic guitar, electric , banjo, mandolin, etc.Colour:BlackMaterial:Aluminum alloySize:Length: about 11.5cmPackage Contents:1x Fretbar Understring LevelerOnly the above package content, other products are not included.Note: Light 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. Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.