Description:Stainless Steel Understring Radius Gauge+Pin Puller Keychain for Guitar Bass Luthier Tool.9pcs stainless steel radius gauges, durable and no rough edges to scratch the fretboard.Radius gauges comes in 9 sizes: 7.25” 9.5” 10” 12” 14” 15” 16” 17” 20” .A great tool for helping you setup your guitar bridge saddle to match the fretboard radius.Suitable for acoustic guitars, electric guitars, or bass bridge saddles setup.Size Chart:Size: Approx. 70×52.5×1.25mm/2.76×2.07×0.05inchPackage Includes:9 Pieces Understring Radius Gauge1 Piece Pin Puller Keychain