Why should fret crowning feel like punishment?

FretGuru SharkFin is a professional guitar fret crowning file designed for luthiers, guitar techs, builders, and serious players who want more control, less fatigue, tighter fret crowns and cleaner results.

Other fret crowning files will get the job done.

SharkFin changes how the work feels – and how tight YOU decide to dial in your fret crowns. There are no training wheels making this decision for you.

By placing your hand directly over the cutting action, SharkFin gives you a more natural top-down feel with precise 1:1 feedback and control. Instead of steering from behind a long handle and squeezing harder than you want to, you can stay more relaxed and let the file do the work.

That's the real difference – less death-grip, less strain, more feel. The tightest possible fret crowns.

At the heart of the system is FretGuru's proprietary D.I.A. cutting geometry, which has become the favorite of top luthiers around the world.

It's designed to stay controllable as the crown narrows, helping you preserve the leveled fret top while dialing in a tight, razor-thin centerline with confidence – without kissing the top of the fret crown.

The cut feels smooth, stable, and predictable, with a chatter-free, ready-to-polish finish.

SharkFin uses high-carbon, heat-treated European steel inserts for long life and repeatable performance on both nickel-silver and stainless steel frets.

Rounded, contoured, beveled edges also help reduce the chance of fretboard scratches and accidental gouges.

If you want to dial in the perfect fret crown with more comfort, more control, and a cleaner path to final polish, SharkFin was built for serious bench time.

This listing is for the MD/LG/XL SharkFin.