Features: Diamond abrasive surface provides a coarse finish for this application; use fret erasers to make the frets as smooth as butter. Four gauge slots are provided: 1mm, 2mm, 3mm, and 4mm. The 1mm slot is suitable for extra narrow frets, such as on ukuleles; the 2mm slot fits all standard guitars, bass, banjo, mandolin, and cigar box guitars; the 3mm and 4mm slots are designed for jumbo frets. This makes it compatible with most stringed instruments. Made from premium carbon steel and firmly coated with diamond-like grit for long-lasting performance. One flat file works on both fret edges and rounded fret ends, delivering the efficient performance of diamond abrasives. The handle is crafted from high-quality solid wood for excellent grip and smooth operation. Package Includes: 1x Fret File 2x Neck Protection Sheets Specifications: Material: Carbon Steel, Diamond Grits, Wood Handle Product Size: 227x20x20mm / 8.9x0.79x0.79in Net Weight: 163g / 0.36lb Note: Please allow 0-1cm error due to manual measurement. Ensure you are comfortable with this before purchasing. Due to differences in monitor displays, the image may not reflect the actual color of the item. Thank you!