--- product_id: 30908020 title: "StewMac Understring Radius Gauges, Set of 9, Standard Width for Guitar Setup, for 6-String Guitars and Most 4-String Basses" brand: "stewmac" price: "NZ$149" currency: NZD in_stock: true reviews_count: 10 category: "Stew Mac" url: https://www.desertcart.nz/products/30908020-stewmac-understring-radius-gauges-set-of-9-standard-width-guitar store_origin: NZ region: New Zealand --- # fits 6-string guitars & 4-string basses 9 precise radius options low-profile for under-string use StewMac Understring Radius Gauges, Set of 9, Standard Width for Guitar Setup, for 6-String Guitars and Most 4-String Basses **Brand:** stewmac **Price:** NZ$149 **Availability:** βœ… In Stock ## Summary > 🎯 Nail your perfect setup every time with StewMac’s ultimate radius precision! ## Quick Answers - **What is this?** StewMac Understring Radius Gauges, Set of 9, Standard Width for Guitar Setup, for 6-String Guitars and Most 4-String Basses by stewmac - **How much does it cost?** NZ$149 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.nz](https://www.desertcart.nz/products/30908020-stewmac-understring-radius-gauges-set-of-9-standard-width-guitar) ## Best For - stewmac enthusiasts ## Why This Product - Trusted stewmac brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - β€’ **Dual-Surface Accuracy:** Top and bottom arcs ensure perfect saddle and pickup height alignment - β€’ **Precision in Every Curve:** 9 radius gauges from 7-1/4" to 20" for flawless fretboard matching - β€’ **Seamless Under-String Access:** Slim design lets you measure and adjust without removing strings - β€’ **Lifetime Durability & Support:** Backed by StewMac’s Lifetime Promise and expert tech assistance - β€’ **Universal Fit for Popular Instruments:** Standard width fits most 6-string guitars and 4-string basses up to 2-5/8" string spread ## Overview StewMac Understring Radius Gauges Set of 9 offers professional-grade precision tools designed for guitar and bass techs. Featuring 9 radius sizes from 7-1/4" to 20", these slim-profile gauges fit under strings for quick, accurate fretboard radius measurement and saddle height adjustment. Ideal for 6-string guitars and 4-string basses, this durable set is backed by a lifetime warranty and expert support, making it the go-to choice for flawless instrument setups. ## Description Product description Product Description StewMac Understring Radius Gauges, Standard Width, Set of 9 Fast, accurate setup made easy. StewMac Understring Radius Gauges are precision tools trusted by pro luthiers and serious guitar techs. Designed for ultra-accurate saddle and pickup height adjustment, these gauges feature matching radius arcs on both the top and bottom surfaces for dual-purpose accuracy. Designed to fit under strings. These slim-profile tools slide easily under strings, letting you measure fretboard radius without string removal. Use the bottom arc to read the radius and the top arc to perfectly set string saddle heights. Ideal for optimizing playability and aligning pickup polepieces to string curvature. Precision for every instrument. Standard-width gauges accommodate most 6-string guitars and 4-string basses (up to 2-5/8" string spread). Extra-wide sets cover extended-range guitars and 5- or 6-string basses (up to 3-3/4" string spread). Choose your set: Standard Set of 4: 7-1/4", 9-1/2", 12", 16" Standard Set of 9: 7-1/4", 9-1/2", 10", 12", 14", 15", 16", 17", 20" Extra-Wide Set of 9: 7-1/4", 9-1/2", 10", 12", 14", 15", 16", 17", 20" BUILT TO LAST A LIFETIME: All StewMac tools are backed by our Lifetime Promise for lifelong durability and our expert support is there when you need it most Compare Repair + Maintenance Essentials Understring Radius Gauges String Action Gauge Action Adjustment Kit Guitar Setup Kit Guitar Tune-up Set Review: 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. Review: 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 desertcart did not have to pay the high stewmac shipping cost. With much faster shipping through desertcart as well. ## Features - COMPLETE SET FOR GUITAR TECHS: Radii include 7-1/4", 9-1/2", 10", 12", 14", 15", 16", 17", 20" for all setups - STANDARD SET of 9: Fits string spreads up to 2-5/8" ideal for 6-string guitars and 4-string basses - ACCURATE STRING HEIGHT MATCHING: Use top curvature to align saddle or polepiece height to fingerboard arc - LOW PROFILE FOR STRING-ON USE: Read fretboard radius and set saddles without removing strings - BUILT TO LAST A LIFETIME: All StewMac tools are backed by our Lifetime Promise for lifelong durability and our expert tech support is there when you need it most ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B01HUCLDZ6 | | Best Sellers Rank | #3,566 in Musical Instruments ( See Top 100 in Musical Instruments ) #69 in Guitar Tools | | Brand | StewMac | | Brand Name | StewMac | | Color | Silver | | Customer Reviews | 4.8 out of 5 stars 146 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 Strings | 6 | | Set Name | Standard Width, Set of 9 | | UPC | 840014709724 | | Unit Count | 1.00 Count | ## Product Details - **Brand:** StewMac - **Color:** Silver - **Guitar Bridge System:** Fixed - **Guitar Pickup Configuration:** Magnetic - **Manufacturer:** StewMac - **Number of Items:** 9 - **Number of Strings:** 6 - **Set Name:** Standard Width, Set of 9 - **UPC:** 840014709724 - **Unit Count:** 1.00 Count ## Images ![StewMac Understring Radius Gauges, Set of 9, Standard Width for Guitar Setup, for 6-String Guitars and Most 4-String Basses - Image 1](https://m.media-amazon.com/images/I/61hKgGiJsoL.jpg) ![StewMac Understring Radius Gauges, Set of 9, Standard Width for Guitar Setup, for 6-String Guitars and Most 4-String Basses - Image 2](https://m.media-amazon.com/images/I/71eBoIk2oqL.jpg) ![StewMac Understring Radius Gauges, Set of 9, Standard Width for Guitar Setup, for 6-String Guitars and Most 4-String Basses - Image 3](https://m.media-amazon.com/images/I/81Fn-sZB5EL.jpg) ![StewMac Understring Radius Gauges, Set of 9, Standard Width for Guitar Setup, for 6-String Guitars and Most 4-String Basses - Image 4](https://m.media-amazon.com/images/I/81Y+TjiI00L.jpg) ![StewMac Understring Radius Gauges, Set of 9, Standard Width for Guitar Setup, for 6-String Guitars and Most 4-String Basses - Image 5](https://m.media-amazon.com/images/I/81nQteJTbCL.jpg) ## Available Options This product comes in different **Size** options. ## Customer Reviews ### ⭐⭐⭐⭐⭐ Quality tools! *by C***A on October 4, 2024* 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. ### ⭐⭐⭐⭐⭐ Awesome *by A***R on March 7, 2024* 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. ### ⭐⭐⭐⭐⭐ Worth the extra money over the cheapies. *by D***L on May 31, 2025* 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. ## Frequently Bought Together - StewMac Understring Radius Gauge Tool, Set of 9, Standard Width for Guitar Setup - StewMac String Action Gauge And Ruler, Metric, Stainless Steel - Designed by StewMac, The Original measuring tool for acoustic and electric guitar, and bass setup - StewMac Fret Rocker - The Original Stainless Steel 4-in-1 Mini Straightedge Luthier Tool, Precision-Machined for Accuracy, Locate High Frets Fast --- ## Why Shop on Desertcart? - πŸ›’ **Trusted by 1.3+ Million Shoppers** β€” Serving international shoppers since 2016 - 🌍 **Shop Globally** β€” Access 737+ million products across 21 categories - πŸ’° **No Hidden Fees** β€” All customs, duties, and taxes included in the price - πŸ”„ **15-Day Free Returns** β€” Hassle-free returns (30 days for PRO members) - πŸ”’ **Secure Payments** β€” Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** β€” Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.nz/products/30908020-stewmac-understring-radius-gauges-set-of-9-standard-width-guitar](https://www.desertcart.nz/products/30908020-stewmac-understring-radius-gauges-set-of-9-standard-width-guitar) --- *Product available on Desertcart New Zealand* *Store origin: NZ* *Last updated: 2026-06-22*