This item is a set of stainless steel guitar string fingerboard ruler and radius gauge luthier tools, rustproof, stable and durable. Accurate, convenient, pocket-sized measuring tool can be taken to everywhere with you. Good helper for bass guitar players, guitarists, luthiers and many DIY fret works. Fit for string instruments such as electronic guitar, bass, acoustic guitar, mandolin, banjo etc. Features - Color: Silver - Material: Stainless steel - Fingerboard ruler size: Approx. 420 x 37 x 3.5mm/16.53 x 1.45 x 0.13 inch - Radius gauge size: Approx. 87 x 87 x 4mm/3.42 x 3.42 x 0.15 inch - Stainless steel guitar string fingerboard ruler and radius gauge set luthier tool. Stable, durable and widely used. - Accurate, convenient, pocket-sized measuring tool can be taken to everywhere with you. - Good helper for bass guitar players, guitarists, luthiers and many DIY fret works. - Fit for string instruments such as electronic guitar, bass, acoustic guitar, mandolin, banjo etc. - Set of 6pcs includes radius gauges in different specifications for different usages. Package list: 1 x Fingerboard Ruler 6 x Radius Gauges