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, banjo, mandolin, cigar box guitars; The 3mm,4mm slot works for jumbo frets. That means it'll work on most stringed instruments.<br> 2. One flat file, works on fret edge and fret end round.You will experience the amazing efficiency of diamond. The hand shank is made of solid wood: excellent grip and smooth operation.<br> 3. Diamond abrasive way to coarse for this application, use fret erasers makes the frets as smooth as buttery.<br> 4. It is made of high quality carbon steel& firmly coated with diamond-like grits. That ensure the long life service of this file.<br> 5.High Wear-resistant and excellent durability<br> Size:227 x 20 x 20mm<br> Net Weight:163g/0.36lb<br> Material:Carbon steel + diamond matte + wood<br> colour:Wood color+silver<br> Package Contents:<br> 1 x Fret File<br> 2 x Neck Protection Sheet<br> Only the above package content, other products are not included.<br> 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.