What instruments can it works on?
It'll works on most stringed instruments frets.
The small size slot works for extra narrow frets, likes ukuleles.
The middle size slot works for all standard guitars, bass, banjo, mandolin, cigar box guitars.
The large size slot works for jumbo frets.
Would it scratched the finger board?
It's possible. We suggest use tape to protect fingerboard before working.(see picture)
Warm tips:
1.Please read user manual before working;
2.Please don't put too much pressure on this fret file when using. Use it slowly and steady will get a better results.
Features:
100% brand new and high quality
Material: High carbon steel/Sapele wood handle/Diamond grits
Products Size:220X18X18mm
Net Weight:170g/0.37lb
Gross Weight:190g/0.42lb
Package Includes
1x Fret File
1x Nylon Oxford Bag
1x User manual