Features: 1. Four gauges slot are provided in 1mm,2mm,3mm,4mm. The 1mm slot works for extra narrow frets, likes ukuleles; The 2mm slot works for all standard guitars, bass, mandolin; The 3mm,4mm slot works for jumbo frets. That means itll work on most stringed instruments. 2. One flat file, works on fret edge and fret end round.You will experience the amazing efficiency of diamond. 3. The hand shank is made of solid wood: excellent grip and smooth operation. 4. Diamond abrasive way to coarse for this application, use fret erasers makes the frets smoother. 5. It is made of high quality carbon steel firmly coated with diamond-like grits. That ensure the long life service of this file. Notice: 1.Actual color may be slightly different from the image due to different monitor and light effect 2.Please allow 1-3cm deviation due to manual measurement Description: Material: carbon steel+diamond grits+wood handle Size: 227*20*20mm/8.9*0.79*0.79in includes: 1x Fret File 2 x Neck Protection Sheet