Guitar Fret Crowning File, Fret Edge File, Fret End Rounded Tool, Three Radius Slot and File, Multi-Function Guitar Fret Tool1. The four-pointer socket is located in 1mm,2mm,3mm,4mm. 1mm works for extremely narrow frets, likes ukulele; 2mm works for all standard guitars, bass guitar, banjo, mandolin, guitar cigar box; 3mm, 4mm socket works on jumbo sills. This means that it will work on most stringed instruments.2. One flat file, works on the edge of the threshold and the round end of the threshold. You will experience the amazing performance of the diamond. The handle is made of solid wood: excellent grip and smooth operation.3. Diamond abrasive for coarse for this application, use threshold erasers makes the frets as smooth as buttery.4. It is made of high-quality carbon steel and heavily coated with diamond grits. Which ensure the long life of this file.5. High wear resistance and excellent durabilitySize: 227 x 20 x 20mmNet Weight: 163g/0.36lb Material: Carbon Steel + Matte Diamond + Wood Color: Wood Color + SilverPackage Contents: 1 x Threshold is your file2 x Neck Protection Will Extra Charges Be AddedOnly the above package content, other products are not included. Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement error is +/- 1-3cm.