The guitar neck notched straight edge is made of high-quality stainless steel, sturdy enough for your long-term use Great for checking guitar neck straightness and flat of the fretboard and frets with the guitar fret ruler Guitar measuring tool works well with most guitars, special for electric guitars Luthiers measurement tool features notched straight edge design, convenient to use Dual scale design on the fretboard measurement tool, works well with the most guitar Guitar neck ruler:Size: 41.8 x 3.7 x 0.4cm/ 16.5 x 1.5 x 0.2inch String action gauge ruler:Size: . 8.5 x 5.4cm / 3.3 x 2.1inch Fret rocker:Size: 10 x 5 x 0.2 cm/3.9 x 2.0 x 0.08 inch Colour:Silver Material:Stainless steel Package Contents: 1 x Guitar neck ruler 1 x String action ruler 1 x Sound post rocker Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.