Check the listing for details. Set of 9 Understring Radius Gauge for Guitar Luthier Tools for Bridge Saddle. Condition: New. Listed at 10.50 USD. Normal 0 7.8 磅 0 2 false false false EN-US ZH-CN X-NONE OUR PLEDGE: If u did not receive order intime, or if u have any problem with our product, pls contact us via email , We will always protect your right, and give u satisfield answer, 100% customer satisfaction is our pursuit. PRODUCT DESCRIPTION: Radius gauges come in 9 sizes: 7.25" 9.5" 10" 12" 14" 15" 16" 17" 20"..Obtain accurate measurements of your instrument's fretboard radius using the bottom radius of the gauge。Then use the matching top radius of this gauge to determine the proper height adjustment for the bridge saddles. They can be used to accurately measure fret board radius, saddle radius nut radius from either the top or bottom radius surface. Specification: Net weight:72g Color : silver Material: Stainless steel Thickness: 1.5 mm