Notched Straight Edge soundhole The cutting depth is adjustable

The cutting depth is adjustable by the brass thumbwheels

The Fret Fingerboard Leveler has 2 precision ground flat surfaces (the narrow sides)

Made of Steel

That is the spaces between the strings are equal not the spacing between centers

Notched Straight Edge soundhole The cutting depth is adjustableThe notched straight edge has become a basic tool for checking fretboards straightness. The notches fit over the frets. Our new designed notched straight edge, made of aluminum with black hardened surface, lighter and more accurateFlat accuracy + . 0008"(0. 02mm). Two edges are notched for different guitars, it works on Fender, Martin, Gibson, 25" Paul Reed Smith and Dobro scale and other guitars. Length 16 1 2 " (420mm) Width 1. 45" (37mm) Thickness