MagiDeal Stainless Steel Guitar Radius Gauges Set of 9 for Luthier Tools Include a set of 9 gauges which come in all popular fingerboard radius size(7.25", 9.5", 10", 12", 14", 15", 16",17", 20") and 1 key ring with guitar shaped charm Easy to accurately measure fret board radius, saddle radius, etc Portable & convenient Fit for guitar, mandolin, bass, ukulele Material: Stainless steel