Frets that have divots or are worn flat will cause poor tone and inaccurate intonation. High frets will cause buzzing in the corresponding area of the fret board when played. By mill filing, recrowning, and polishing the frets to a mirror finish, the performance of your instrument will be greatly improved! Level frets are a must for a proper set up. Even brand new instruments can have unlevel frets and need work to insure a proper set up! Price Does Not Include Set Up Fee.