Understring radius gauges, set of 9 Luthier Tool, Stainless steel
   Understring radius gauges for guitar setup
Made in high quality hardened stainless steel
Includes radius: 7.25" - 9.5" - 10" - 12" - 14" - 15" Â - 16" - 17" - 20"
This tool will let you to adjust easily and fast the  height of the bridge saddlesÂ
Each of these unique gauges has an accurately radiused arc on both  the top and bottom surfaces, and is shaped to fit easily under the  strings.
Use the bottom curvature to determine your fretboard radius, and the  matching top curvature becomes a reference for setting string saddle  heights for best playability.  Â
Indispensable in any luthier workshop