This item is a set of guitar leveling ruler, perfect for obtaining accurate action measurements for bass, electric guitar and acoustic guitar. It is an useful and measurement for musicians to correct the height of the strings. And tool for checking the straightness and flat of the guitar fret-board. Features -Color: Silver -Material: Stainless Steel - Guitar neck ruler Size: 41.8 x 3.7 x 0.4cm/ 16.5 x 1.5 x 0.2in - String action gauge ruler Size: 8.5 x 5.4cm/3.3 x 2.1in - Fret rocker Size: 10 x 5 x 0.2 cm/ 3.9 x 2.0 x 0.08 in - Designed for checking guitar neck straightness of the fret-board. - It is made of metal materials and can be used for a long time. - With small size and light weight design, it is convenient for us to carry. - Can be used necessary tool for proper truss rod adjustment. - for checking for straightness before leveling your frets. Package list: 1 x Fret rocker 1 x Guitar neck notched straight x String action gauge ruler