--- product_id: 254833104 title: "FretGuru Diamond SharkFin Fret Crowning File MD/LG" price: "Β₯25421" currency: JPY in_stock: true reviews_count: 13 url: https://www.desertcart.jp/products/254833104-fretguru-diamond-sharkfin-fret-crowning-file-md-lg store_origin: JP region: Japan --- # Dual Integrated Arc geometry for precision Industrial diamond cutting surface High-carbon steel for durability FretGuru Diamond SharkFin Fret Crowning File MD/LG **Price:** Β₯25421 **Availability:** βœ… In Stock ## Summary > πŸ’Ž Crown your frets like a proβ€”comfort, precision, and durability in one sleek tool! ## Quick Answers - **What is this?** FretGuru Diamond SharkFin Fret Crowning File MD/LG - **How much does it cost?** Β₯25421 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.jp](https://www.desertcart.jp/products/254833104-fretguru-diamond-sharkfin-fret-crowning-file-md-lg) ## Best For - Customers looking for quality international products ## Why This Product - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - β€’ **Built to Last:** High-carbon steel and diamond grit ensure long-lasting, consistent performance - β€’ **Chatter-Free Cutting:** Smooth, ready-to-polish fret crowns with minimal sanding required - β€’ **Comfort-First Design:** Relaxed cutting stroke prevents wrist and forearm strain during long sessions - β€’ **Precision D.I.A. Geometry:** Achieve razor-thin, perfectly crowned frets without damaging fret tops - β€’ **Ergonomic Top-Down Control:** Reduce hand fatigue with natural grip and direct cutting feedback ## Overview The FretGuru Diamond SharkFin Fret Crowning File MD/LG is a professional-grade luthier tool designed for frets .080" to .110" wide. Featuring ergonomic top-down control and proprietary Dual Integrated Arc geometry, it delivers precise, chatter-free fret crowning with minimal fatigue. Crafted from high-carbon steel with an industrial diamond cutting surface, it offers long-lasting durability and smooth finishes, making it ideal for serious bench time and fast fret repairs. ## Description Buy FretGuru Diamond SharkFin Fret Crowning File MD/LG | Ideal for Frets .080" to .110" Wide, Pro Luthier Fret Repair Tool, Ergonomic Top-Down Control, Creates Razor-Thin Crowns: Tools - desertcart.com βœ“ FREE DELIVERY possible on eligible purchases Review: Works well, price is right - This was my first time crowning frets so I have no experience to compare this with other files. But I did sucessfully crown my frets without gouging my fingerboard, so that says something right there. This file was recommended from a Youtube video as a money saving alternative to a Z file. I felt like the file is easy to use and works about as fast as I would expect, maybe even a little faster. I was using 6150 fret wire. By using both sides of the file, I was able to get a hairline crown on all my frets; in hinesight, next time I do this, I would leave the lower frets with a wider crown since they wear faster and intonation is not so much of a problem on the lower frets. The file leaves significant tooling marks that must be polished out, I am speculating that the diamond dust files would be better in this regard. The file can also be used to round the fret ends but it is not designed for that and does just an "okay" job at that. Still at about half the price of a diamond dust file and pretty much fool proof action, I am very happy with it. Review: It's super easy to use, huge difference - I have a fantastic luthier, but he's so good he's always busy, so wanted to learn to do some stuff myself. This fret dagger is a fantastic little investment. I tend to make flat spots pretty bad on my frets with my weird crippled left hand, so I often need to do a quick re-crown during a string change to take out some buzz. This fret dagger works great and makes it real fast. Tape it up, check which side to use, paint 'em with the marker, and crown 'em quick. Hit 'em with the sanding sponge and 000 steel wool, clean and lemon-oil the fingerboard and the thing plays wonderful again. I can do that a good 4-5 times before having to do a partial re-fret at the luthier. I've had it about 10 months now, used it a ton, very happy with it. I make sure to clean it good with a brush after every fret, and the teeth on the thing seem to be lasting quite well. At the price, I'm not too worried about the teeth lasting, it's a good investment for my use case. Absolutely recommend the thing. Just a great tool to have when you've got some buzzing flat spots. Fully awesome at crowning the full fret levels I've done as well. ## Features - ERGONOMIC TOP-DOWN CONTROL: SharkFin places your hand directly above the cutting action, allowing controlled downforce without using a death grip – reducing fatigue during repetitive fret crowning work & providing true 11 cutting feedback - RELAXED UN-GRIP CUTTING STROKE: Designed so you can ease your grip during the cutting stroke & stay relaxed on the back stroke helping prevent hand pain, wrist, forearm strain & the cumulative fatigue that makes fret crowning feel like punishment; comfort you'll notice on the first fret & appreciate even more on the final fret - D.I.A. CUTTING GEOMETRY FOR PRECISION CROWNS: Proprietary Dual Integrated Arc (D.I.A.) geometry delivers exceptional control & predictability as the crown narrows prevent you kissing the fret top so your freshly leveled frets stay intact while you dial in razor-thin centerlines - CLEAN CUTS READY-TO-POLISH FINISH: Chatter-free cutting leaves smooth crowns with minimal file marks so you sand less, preserve the crown & arrive at sparkling frets faster. The SharkFin design also solves the challenge of working on your upper frets with plenty of clearance for the guitar body & toggle switch - BUILT FOR SERIOUS BENCH TIME: Made from high-carbon steel with finely graded industrial diamond cutting surface for long life - consistent performance on nickel-silver & stainless frets; rounded, contoured, beveled edges and corners help protect fretboards & guitar tops from deep scratches and gouges ## Technical Specifications | Specification | Value | |---------------|-------| | Best Sellers Rank | #7,793 in Musical Instruments ( See Top 100 in Musical Instruments ) #158 in Guitar Tools | | Customer Reviews | 4.8 out of 5 stars 1,366 Reviews | ## Images ![FretGuru Diamond SharkFin Fret Crowning File MD/LG - Image 1](https://m.media-amazon.com/images/I/61vGdjvo76L.jpg) ![FretGuru Diamond SharkFin Fret Crowning File MD/LG - Image 2](https://m.media-amazon.com/images/I/81i49wg1hIL.jpg) ![FretGuru Diamond SharkFin Fret Crowning File MD/LG - Image 3](https://m.media-amazon.com/images/I/818SdhXPhvL.jpg) ![FretGuru Diamond SharkFin Fret Crowning File MD/LG - Image 4](https://m.media-amazon.com/images/I/81S-j71q-1L.jpg) ![FretGuru Diamond SharkFin Fret Crowning File MD/LG - Image 5](https://m.media-amazon.com/images/I/81Tzwm+9XaL.jpg) ## Available Options This product comes in different **Color** options. ## Questions & Answers **Q: Will this tool work for stainless steel frets?** A: Yes. It will just take more elbow grease on your end, and wear out the tool faster **Q: Will it work on low narrow frets on mandolins** A: Hello Richard, Depending on how narrow your mandolin frets are, this may not be the ideal file for that application. Do you know how wide the frets actually are? The sweet spot for the narrow side of this file is around .080" to .095" + or so. The good news is we have a smaller version of this file in the works. **Q: How long should it last? I've used my 2.0 on about 25-50 necks and it seems dull.** A: 25 to 50 necks? Then It paid for itself eons ago. I've only done 2 necks so far. If it's like my other files then it should last a lifetime. That is, if you keep it clean at all times with a brass brush and chalk. And store it in a dry place. Hope I get 50 necks out it. I'll be doin a stainless fret job soon. True test on that one, **Q: Is it faster to use expedited shipping? Does it come with tracking number?** A: Yes, if you order the "Seller fulfilled" version (will say Ships from FretGuru / Sold by FretGuru, NOT "Ships from Amazon") and select Expedited, I can personally package it now and get it out the door today (Saturday). You'll get the tracking number. Thanks! Bernie / FretGuru ## Customer Reviews ### ⭐⭐⭐⭐⭐ Works well, price is right *by A***R on October 25, 2024* This was my first time crowning frets so I have no experience to compare this with other files. But I did sucessfully crown my frets without gouging my fingerboard, so that says something right there. This file was recommended from a Youtube video as a money saving alternative to a Z file. I felt like the file is easy to use and works about as fast as I would expect, maybe even a little faster. I was using 6150 fret wire. By using both sides of the file, I was able to get a hairline crown on all my frets; in hinesight, next time I do this, I would leave the lower frets with a wider crown since they wear faster and intonation is not so much of a problem on the lower frets. The file leaves significant tooling marks that must be polished out, I am speculating that the diamond dust files would be better in this regard. The file can also be used to round the fret ends but it is not designed for that and does just an "okay" job at that. Still at about half the price of a diamond dust file and pretty much fool proof action, I am very happy with it. ### ⭐⭐⭐⭐⭐ It's super easy to use, huge difference *by P***L on December 12, 2022* I have a fantastic luthier, but he's so good he's always busy, so wanted to learn to do some stuff myself. This fret dagger is a fantastic little investment. I tend to make flat spots pretty bad on my frets with my weird crippled left hand, so I often need to do a quick re-crown during a string change to take out some buzz. This fret dagger works great and makes it real fast. Tape it up, check which side to use, paint 'em with the marker, and crown 'em quick. Hit 'em with the sanding sponge and 000 steel wool, clean and lemon-oil the fingerboard and the thing plays wonderful again. I can do that a good 4-5 times before having to do a partial re-fret at the luthier. I've had it about 10 months now, used it a ton, very happy with it. I make sure to clean it good with a brush after every fret, and the teeth on the thing seem to be lasting quite well. At the price, I'm not too worried about the teeth lasting, it's a good investment for my use case. Absolutely recommend the thing. Just a great tool to have when you've got some buzzing flat spots. Fully awesome at crowning the full fret levels I've done as well. ### ⭐⭐⭐⭐⭐ Great invention. Totally worth it! *by J***E on December 29, 2022* I don't normally do reviews...but when I find a new tool that does an old job well, I'll make an exception. My first impression? Elegant, simple, nicely refined surfaces. The handle edges are rounded, comfortable, and the swell at the end makes for a nice palm grip. This is a solid piece of tool steel with a concave rounded edge that as far as files go, is sharp and effective at crowning frets. I will note though, too much pressure will create a washboard surface on the fret...so let the file do the work. Like I said, as a file it's sharp. It does well at removing material in a convex shape that's perfect for a fret crown. There are two sides to this file...medium and large. The differences appear to be how deep the concave file surface is. I would still recommend taping your fretboard to keep from scratching it. The file's surface that can touch the fretboard is smooth and not abrasive, however shavings will still get between the smooth edge (of the tool) and the fret board and create etches in the fret board. It won't go through tape though. I would also recommend using some fret rubbers (erasers) to polish the frets to a nice glass-like surface. This file does well at crowning, but it shouldn't be expected to create a polish. Doing a proper fret job requires a series of steps. This tool is perfect for one of those steps - crowning. All that said, I'm glad to have this on my bench. It'll get plenty of use. Highly recommended! ## Frequently Bought Together - FretGuru Guitar Fret Crowning File - Dual Sided Dagger 2.0 - MD and LG/XL - Ideal for Frets between .080" to .110" wide - Professional Luthier Tool for Electric, Acoustic and Bass Guitars - FretGuru Ultimate Fret End File 2 - Fix Sharp Fret Ends, Fret Sprout, Fret End Dressing File Pro Luthier Tool Guitar Tech [FINALLY AVAILABLE AGAIN - ADVANCED NEW DESIGN SHIPPING NOW] - FretGuru Leveling Beam Replacement Sandpaper - 400 Grit 5 - Pack Advanced Ceramic Film - Backed Self - Adhesive Strips for All Sanding Beam Fret Leveler 16” 400mm P400 --- ## 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.jp/products/254833104-fretguru-diamond-sharkfin-fret-crowning-file-md-lg](https://www.desertcart.jp/products/254833104-fretguru-diamond-sharkfin-fret-crowning-file-md-lg) --- *Product available on Desertcart Japan* *Store origin: JP* *Last updated: 2026-09-19*