About this product: 1. A flat file for rounding the edge of the fingerboard and of the fingerboard. You experience the amazing efficiency of the diamond. 2. Scope of application - not only for crowning guitar frets, but also for electric guitars, acoustic guitars, basses, ukuleles, etc.; a good and to do this if the frets are worn. 3. The diamond grind is too rough for this application, using a fretboard eraser make the fretboard as smooth as cream. 4. It is made of high quality carbon steel and is firmly coated with a diamond-like abrasive. This guarantees a long service life for this file. Description Material: metal+plastic Color: As Shown Size: 20 x 1cm Package Contents: 1 x Fingerboard file 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.