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🎸 Master your setup like a pro—because your guitar deserves precision.
The StewMac Understring Radius Gauges Set of 9 offers nine meticulously crafted radii from 7¼" to 20", designed for standard-width 6-string guitars and 4-string basses. Its low-profile design enables string-on adjustments, making it an essential precision tool for guitar technicians. Built with durability and backed by a lifetime warranty, this set is a professional-grade solution for flawless fretboard and saddle alignment.









| ASIN | B01HUCLDZ6 |
| Best Sellers Rank | #5,843 in Musical Instruments ( See Top 100 in Musical Instruments ) #119 in Guitar Tools |
| Brand | StewMac |
| Brand Name | StewMac |
| Color | Silver |
| Customer Reviews | 4.8 out of 5 stars 158 Reviews |
| Guitar Bridge System | Fixed |
| Guitar Pickup Configuration | Magnetic |
| Included Components | Set of 9 radius gauges |
| Instrument | guitar |
| Instrument Size | Standard Width, Set of 9 |
| Manufacturer | StewMac |
| Manufacturer Part Number | 0353 |
| Model Name | Understring Radius Gauge Tool, Set of 9, Standard Width for Guitar Setup |
| Model Number | 0353 |
| Number of Items | 9 |
| Number of Strings | 6 |
| Set Name | Standard Width, Set of 9 |
| UPC | 840014709724 |
| Unit Count | 1 Count |
C**A
Quality tools!
We all know these tools from StewMac are expensive, but it's for good reason. These are all you'll need for radius gauges. They are accurate on top and bottom side. Easy to use.
A**R
Awesome
It is stewmac so you know it is made with precision and good quality. A must have tool if you have fixed or hardtail bridges. And because I bought it through Amazon did not have to pay the high stewmac shipping cost. With much faster shipping through Amazon as well.
D**L
Worth the extra money over the cheapies.
These are a bit pricey but, trust me, you get what you pay for with luthier tools. Believe me, I've learned the hard way on a few things over the years. It's the same with this product. You can find gauges for $10.00 a set. Don't fall for it. They'll either be inaccurate, have sharp edges, won't fit under the strings, or all of the above. Just fork over the extra $20 or $30 and be done with it. Buy once, cry once. You'll be glad you did.
R**T
Good quality tools
Much better quality than the cheap junk elsewhere. Higher priced than others, but worth the extra cost. I’d bought one of those mega 17-piece kits (assorted gauges, scales, notched straight edge etc.) priced under $30, and the under string radius gauges were so thick, they would not fit between the strings and body at bridge. These StewMac are narrower and fit where they need to get to. Buy there.
J**N
best there is
Come on... it's StewMac stuff. It's a no brainer when looking for quality products. It's like buying a Honda lawn mower, you know you're getting the best there is.
E**K
Buy them!!
Thin enough to fit under the strings. A real game-changer!
J**H
Works great.
Very simple to use, they work the way they're supposed to & helped with fine tuning the radius of the strings to match radius of the fretboard for playability, made of really good material, I recommend this product.
W**E
It's StewMac - what do you expect.
1. They seem expensive for what you are getting. 2. They are highly accurate - probably the best you will find anywhere. 2a. Buy a couple of the cheaper versions and these, and you will find the others are a waste of money. 3. If you have any issues, StewMac will take care of you. It is part of the higher entry cost. If these are tools you plan to use more than one time, you won't be disappointed with what you get. Highly recommended.
D**.
Excelentes
Tienen una excelente precision, sobretodo para medir el radio por debajo de las cuerdas y calibrar la altura de las selletas del puente (que no me explico porque muchos lo miden por encima de las cuerdas si la parte de abajo de las cuerdas es la que toca los trastes) Muy recomendables, mejores que otras herramientas mas baratas que tienen un corte deforme con secciones planas, estas SI tienen un corte uniforme por toda su superficie, tanto por abajo como por arriba de la herramienta
S**U
TOP . Molto buoni
Anche questi calibri - dime per la regolazione dell'altezza corde per chitarre elettriche sono i migliori . Ben fatti, materiale molto buono e precisi. Ovviamente di Stewart McDonald.
D**O
Confianza total en la marca
Todas las herramientas de esta marca son la gama máxima de la calidad
C**N
Qualitatif
Rien à dire, c'est du bon matos
Trustpilot
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