9Pcs Understring Radius Gauges Guitar Bass Strings Repair Polish T-shaped Measurement

Info:
Features:
9 radius sizes: 7.25 9.5 10 12 14 15 16 17 20.
Made of stainless steel, durable enough.
Engraved with radian on the ruler.
Easy to measure radius under strings.
Accurately configure your guitar bridge saddles to fit the fingerboard radius.