9Pcs/Set Stainless Steel Guitar Understring Radius Gauge Builder Tool for Luthiers Bass String Repair Kit Guitar Accessories Specifications: Made of stainless steel, durable enough. Etched with a ray on the handle. Easy to measure radius from above or below the strings. Accurately configure the guitar's saddle bridge to match the radius of the fretboard. Item Name: Understring Radius Indicator Quantity: 9pcs/set Material: Stainless Steel Radius: 7.25, 9.5, 10, 12, 14, 15, 16, 17, 20 Size: 6.6cm x 7cm x 0.1cm/2.60" x 2.76" x 0.04" (Approx.) Notes: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Package Included: 9 x Pull-Up Radius Indicator