This is a set of 3 guitar maintenance tools, including a guitar ruler and fret protector plates. This 3-piece guitar maintenance set includes two types of guitar rulers for adjusting the height of various parts of the guitar, such as string height, nut, and saddle, and two fret protector plates to prevent the fingerboard from being scratched when applying abrasive materials to the frets. Suitable for all stringed instruments: This can be used for the maintenance of various stringed instruments because of its wide range of compatible instruments. Small plate size: Approximately 7.8 x 1.2 cm Large plate size: Approximately 7.8 x 2 cm Stainless steel ruler (size: approx. 89 x 51mm, weight: approx. 25g) Plastic ruler (size: approx. 85 x 54mm)