This sanding stone is a necessary tool kit for luthiers, guitarists for many DIY fret workers. It is useful to many kinds of musical instrument. Fret polishing, it gives us a nice smooth feel. the need to the entire fingerboard. Comes with 2pcs fret protector shims for protecting your guitar or bass fretboard from scratching or damaging while filing and polishing. tool for luthiers, guitarists, and many DIY fret workers. Feature - Color: Brown - Material: Grindstone and Stainless Steel - Sanding Size: 11mm - Wide Fretboard size: 79 x 23mm - Narrow Fretboard size: 79 x 14mm - Authentic size, which can adapt to majority of frets. - The shims made of stainless steel, hard-wearing and sturdy. - 2pcs fret protector shims for protecting your guitar or bass fretboard from scratching or damaging while filing and polishing. - The sanding stone is a great way to touch up frets. Conforms to frets to give a nice rounded profile. Idea for neck fretboard fret wire polishing. - Great for luthiers, guitarists, and many DIY fret works. Package list: 2 x Shim 1 x Sander