This set includes: 4Pcs Stainless Steel Guitar Notched Radius Gauge Fingerboard Guitar Ruler,  9 pcs Understring Radius Gauge for Guitar and Bass Setup Luthier Tools and 32 pieces string distance ruler

Accurate Measurement - Obtain accurate measurements of your instrument's fretboard radius using the bottom radius of the gauge

Guitar notched radius gauge fingerboard is compatible with string instruments, such as guitar, bass, banjo, ukulele, mandolin, etc. It is light and portable, you can put it in your pocket and carry it with you. It comes with two narrow radius gauges and two wide radius gauges in 7.25”, 9.5”, 10”, 12”, 14”, 15”, 16”, 20 ” radii. It can be used to measure the string distance, bridge saddle height and depth, fret groove depth. The edge of the measuring ruler is carefully polished and polished, so you can use it at any time without worrying about scratching your fingers.