1. This product features four gauge slots available in 1mm, 2mm, 3mm, and 4mm. The 1mm slot is suitable for extra narrow frets, such as those found on ukuleles; the 2mm slot is ideal for all standard guitars, basses, banjos, mandolins, and cigar box guitars; while the 3mm and 4mm slots are designed for jumbo frets, making it compatible with a majority of stringed instruments. 2. Included is one flat file, perfect for fret edge and fret end rounding. You'll enjoy the remarkable efficiency provided by diamond. The hand shank is crafted from solid wood, ensuring excellent grip and smooth operation. 3. The diamond abrasive is coarse enough for this application, while fret erasers will make the frets as smooth as butter. 4. It is constructed from high-quality carbon steel that is firmly coated with diamond-like grits, ensuring the long-lasting durability of this file. 5. Highly wear-resistant with excellent durability. Size: 227 x 20 x 20mm Net Weight: 163g/0.36lb Material: Carbon steel + diamond matte + wood Color: Wood color + silver Package Contents: 1 x Fret File, 2 x Neck Protection Sheet Only the above package content is included; other products are not part of the package. Note: Light shooting and different displays may cause the color of the item in the picture to slightly differ from the actual product. Allowable measurement error is +/- 1-3cm.