Will this tool work for stainless steel frets?

Yes. It will just take more elbow grease on your end, and wear out the tool faster

Will it work on low narrow frets on mandolins

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.

How long should it last? I've used my 2.0 on about 25-50 necks and it seems dull.

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,

Is it faster to use expedited shipping? Does it come with tracking number?

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

Fretguru Diamond Sharkfin Fret Crowning File Md Lg

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$164.79

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Description

💎 Crown your frets like a pro—comfort, precision, and durability in one sleek tool!

BUILT TO LAST PROTECT - Premium steel with beveled edges guards your fretboard from scratches while delivering consistent pro-level results.
ERGONOMIC TOP DOWN CONTROL - Reduce hand fatigue with natural grip and precise downforce for marathon fret crowning sessions.
CHATTER FREE CUTTING SURFACE - Smooth, ready-to-polish fret crowns with minimal sanding—get gig-ready frets faster.
VERSATILE MEDIUM LARGE FILE SIDES - Two-in-one design adapts to frets from .080" to .110" wide, saving time and space in your toolkit.
DUAL INTEGRATED ARC D I A GEOMETRY - Achieve razor-thin, perfectly shaped fret crowns that preserve your fret leveling work.

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 crowns with minimal effort and fatigue. Crafted from high-carbon steel with an industrial diamond cutting surface, it ensures long-lasting performance on nickel-silver and stainless frets while protecting your guitar’s fretboard. Ideal for serious bench time, this versatile two-sided file streamlines fret repair and setup, making it a must-have for both beginners and seasoned guitar techs.

Specifications

ASIN	B08P81H8Q2
Best Sellers Rank	#7,122 in Musical Instruments ( See Top 100 in Musical Instruments ) #136 in Guitar Tools
Body Material	Tool Steel
Color Name	Diamond Sharkfin MD/LG
Customer Reviews	4.8 4.8 out of 5 stars (1,366)
Date First Available	November 27, 2020
Item Weight	4.2 ounces
Item model number	FG-DSF-ML
Material Type	Tool Steel
Product Dimensions	8 x 1 x 0.5 inches
Proficiency Level	All From Beginners to Luthiers

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