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Item #:
59945573
Diamond SharkFin Fret Crowning File | Professional luthier fret repair tool, Top-down ergonomic control, D.I.A. geometry for razor-thin crowns
87% of respondents would recommend this to a friend
Item #:
59945573
WST 308
Price Details
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Faster Cut, Smoother Finish - The Dagger’s exclusive D.I.A. (Dual Integrated Arc) design gives you greater cutting control, perfect fret centerlines and a finer fret finish.
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What Stands Out
Ergonomic Design
The top-down ergonomic control ensures comfortable handling, allowing luthiers to work efficiently and reduce hand fatigue while crowning frets.
Precision Crowning
With razor-thin crowns, this file offers exceptional accuracy in fret crowning, resulting in improved playability and tone quality for both guitar and bass.
Versatile Sizing
Available in medium, large, and extra-large sizes, the fretguru sharkfin caters to various fret sizes, making it a go-to tool for all luthiers.
Product Details
| Item Weight | 3.9 ounces (110.57 grams) |
| Product Dimensions (L x W x H) | 4.15 x 1.3 x 1.75 inches (10.5 x 3.3 x 4.4 cm) |
| Item model number | Diamond SharkFin |
| Date First Available | May 7, 2026 |
| Color Name | Diamond SharkFin V2 |
Who Should Buy?
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Professional Luthiers
Ideal for experienced luthiers seeking precision and control in fret crowning and finishing for various guitar types.
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DIY Guitarists
Perfect for hobbyist guitar players wanting to maintain their instruments at home with high-quality fret filing tools.
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Fret Repair Shops
A great addition to repair shops that deal with fret leveling and crowning on electric, acoustic, and bass guitars.
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Beginner Players
Not suitable for beginners who lack experience with fret work and may prefer simpler tools for maintenance.
Product Description
Diamond SharkFin Fret Crowning File | Professional luthier fret repair tool, Top-down ergonomic control, D.I.A. geometry for razor-thin crowns
Have any Query? Chat with us
Customer Questions & Answers
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Question:
What is the exclusive D.I.A. cutting geometry?
Answer: It is a cutting design that provides better cutting control, accuracy, and finish than any other file. -
Question:
Why are precise fret centerlines important?
Answer: Precise fret centerlines are important for accurate fret crowning and better guitar tone. -
Question:
Are the edges of the file smooth and contoured?
Answer: Yes, the edges are designed to prevent damage to frets and the fretboard. -
Question:
Will this tool work for stainless steel frets?
Answer: Yes. It will work but may require more effort and may wear out the tool faster. -
Question:
Will it work on low narrow frets on mandolins?
Answer: The FretGuRu Crowning File is compatible with 6105 medium-large and 6100 large and extra frets. -
Question:
How long should it last if used on multiple necks?
Answer: With proper maintenance, it should last a lifetime. Regular cleaning with a brass brush and chalk and storing in a dry place will help prolong its lifespan. -
Question:
Is the medium/large channel smaller than the original FretGuRu Crowning File?
Answer: The channels may still be too big, causing annoyance to some users. -
Question:
Will this work on a Taylor with 6230 fret wire?
Answer: It should work, but success may vary based on individual skill level. The control provided by the Fret Guru may help achieve good results. -
Question:
Can beginners use this with a leveler for fretwork?
Answer: This file may not be suitable for beginners as it can easily clog and chatter if not used carefully. -
Question:
Will this work on a 5-string banjo?
Answer: Yes, it is compatible with a 5-string banjo. -
Question:
Will the smaller side of the file work on vintage tall frets on a new neck?
Answer: If the Fret Guru file cannot do the job on narrow vintage frets, it is unlikely that any other file will be more effective. -
Question:
Does this tool work for fret ends as well?
Answer: It is not recommended to use a fret crowning file for fret ends. It is better to use a dedicated fret end file for this purpose.
FretGuru Tools Diamond SharkFin Editorial Review
The FretGuru Fret Crowning File is a highly rated, diamond dagger fret crowning tool that is suitable for use on electric, acoustic, and bass guitars with medium, large, or extra-large frets. Customers have praised its precision, ease of use, and value for money. The file is directional and works in the "push" direction. Customers recommend using a fine wire brush to keep the teeth clean. The file lasts a lifetime if it is cleaned and stored in a dry place. However, customers have noted that it takes more elbow grease to use on stainless steel frets, and the diamond coating may wear off after several uses.
Customer Reviews & Ratings
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Pros
- Highly rated for its precision and ease of use
- Suitable for use on electric, acoustic, and bass guitars with medium, large, or extra-large frets
- Cost-effective compared to other fret crowning tools on the market
- Long-lasting if it is cleaned and stored in a dry place
Cons
- May require more elbow grease to use on stainless steel frets
Platform Trust & Buyer Confidence
MA
Mohammad
Verified buyer
“Excellent quality and original too,when ubuy send original things I will appreciate that ,I very satisfied thank you”
23 July 2026 · via Trustpilot
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Chitra
Verified buyer
“The order and delivery progress was communicated very well. Package arrived within the estimated time. Products arrived as expected in good condition.”
22-Jul-26 · via Trustpilot
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kund
Verified buyer
“Good supply of products. Safe payment methods, and shipment worldwide! Genuine products.”
23-Jul-26 · via Trustpilot
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Onesi
Verified buyer
“Was my first time buying a product from Ubuy, but I found it so helpful. This is reliable. Gonna place a new order!”
22 July 2026 · via Trustpilot
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SAO JOHN
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“Ubuy is a great online platform to buy stuff. Reliable, fast delivery time and great value for money. I've been using Ubuy online shopping platform for three years now and will continue to do so.”
23 July 2026 · via Trustpilot
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WST 308
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Features & Benefits
- New FretGuru file has improved performance
- Exclusive D.I.A. cutting geometry gives precise cutting control, accuracy, and finish
- Ideal-yet-elusive HOLY GRAIL for accurate fret crowning achieved
- Smooth beveled, contoured edges prevent damage to frets and fretboard
- Precisely leveled and crowned frets are crucial for great guitar tone
- Faster and easier to use, with greater efficiency
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