Product Description

Level Frets with Full String Tension

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StewMac Fretbar Understring Leveler

is a revolutionary tool that allows you to level frets under full tension, ensuring precise and accurate results. Designed to fit

under and between the strings

, this tool eliminates guesswork and helps you achieve perfect fretwork every time.

The Original Understring Leveler – by StewMac

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Matt Brewster of 30th Street Guitars

, who brought us the concept of fret leveling with the strings still on. StewMac transformed this idea into the

Fretbar Understring Leveler

, making professional fretwork faster, easier, and more accurate.

Precision Engineering for Luthiers & Guitar Techs

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extruded 6061 aluminum

, the Fretbar guarantees a surface accuracy of

±0.0015" per foot

. It works seamlessly with our 1" wide 3M Stikit Gold Abrasives, allowing for

quick setup and ultra-smooth leveling

.

Versatile Sizes for Every Fret Job

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4.5" Fretbar:

Ideal for spot-leveling and creating fallaway on acoustic guitars.

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9" Fretbar:

Great for ukuleles, mandolins, and full-scale spot leveling.

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18" Fretbar:

Quickly levels an entire neck with precision and ease.

Includes the StewMac String Jack

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String Jack

lets you raise the strings at the nut without altering neck tension, ensuring accurate leveling results.

Works with Strings On or Off

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all-around fret leveling tool

when used with the strings removed.

BUILT TO LAST A LIFETIME, WITH SUPPORT YOU CAN TRUST

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From the brand

If any of our products ever break, wear out, or fail to exceed your every expectation, simply return it for a replacement. Quality you can trust, for life.

We collaborate with the world's top luthiers to create solutions and educational materials for guitar repair. We also employ techs with decades of experience to assist our customers.

At StewMac the guitar lives in our hearts — we're players, builders, repair pros, and curious tinkerers, just like you!

We have everything you need to build, repair, and finish your guitars.