Function: 1.Made of high quality stainless steel material, anti-deformation, anti-rust and durable. 2. Fine workmanship, smooth surface, will not scratch your guitar. 3. Guitar neck notch straight edge design dual scale, can be used with most guitars. 4. Straight ruler with cutouts, convenient to use without interference from frets. 5. Perfect tool for checking guitar neck straightness or flatness of fretboard or fret. Specifications: Material: Stainless Steel Color: Silver Size: Approx. 16.5 x 1.4 x 0.2in Packing List: 1 x Guitar Neck Notch Straight Ruler