Guitar maintain and repair set: you will get 1 piece guitar neck notched string measurement ruler, 1 piece string action ruler and fret rocker string height gauge and 1 piece guitar fret rocker leveling tool, different tools can satisfy your needs easily Rust-proof material: the fret rocker and notched straight edge are made of stainless steel, sturdy enough for your long-term use and not easy to scratch your guitars Keep the guitar neck straight: the guitar straight edge, fret leveling tool and the guitar string ruler help you to measure if the surface of the fingerboard is straight and check the final height after you've redressed or replaced them Wide usages: the string action ruler helps to measure bridge slot, the height of the string, nut and pickup polepiece, even the depth of the fret slot; The notched straight edge ruler helps to check if each fretboard is in the same level, the fret rockercan span over 3 frets and can check if frets are on the same level Nice gifts: these guitar luthier tools are good gifts to guitar technicians and guitarists to maintain and repair their instrument themselves in a short time, reducing buzzing; Good tools for electric guitar, acoustic guitar, bass, banjo and folk guitar,etc. 3 Kinds of guitar repair tool: Different tools allow you to get more exact datas and get rid of buzzing easily during playing the guitar. You also can choose one of them that you think it easier to get the result. Wide applications: The string action gauge with scales can esily tell you the height of the the string, nut and pickup polepiece, even the depth of the fret slot. The guitar straight edge is long enough to observe if the fretboard is straight. The function of the fret leveling tool can be gained according the name, a nice tool for you to span over 3 frets, if it rocks, it means that frets are unlevel. Specifications: Guitar neck ruler : Material: stainless steel Size: 41.8 x 3.7 x 0.4cm/ 16.5 x 1.5 x 0.2inch String action gauge ruler: Material: plastic Size: approx. 8.5 x 5.4cm / 3.3 x 2.1inch Weight: approx. 12 g Fret rocker: Size: 3.9 x 2.0 x 0.08 inch/ 10 x 5 x 0.2 cm Weight: 1.75 oz/ 50 g Material: stainless steel Package includes: 1 x Fret rocker 1 x Guitar neck notched straight edge luthiers tool 1 x String action gauge ruler