GUITAR NECK STRAIGHT EDGE (Notched)--PRS 24.5"/ 25" scale length Designed to check guitar neck straightness of the fretboard and not just the frets One side is 25" PRS/Carvin Neck- Thru, and the other side is for 24.5"Short PRS 6061 Aluminium- Nice Brushed Finish Machined Edges for Flatness / Cheaper Tools Ae Not