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 Fret Crowning File Dagger 2 0 Professional Guitar Luthier

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Fully operational. Shipping worldwide, on schedule.Customs & duties included in the price

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Sold byAmazon JapanDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🎯 Crown your frets like a pro — precision, speed, and style in one sharp tool!

ERGONOMIC DAMAGE FREE - Smooth beveled edges and balanced handle prevent fretboard and guitar body damage while reducing hand fatigue.
VERSATILE COMPATIBILITY - Dual-sided file fits most guitars from vintage acoustics to modern electrics, including jumbo fret sizes.
PRECISION CUTTING CONTROL - Exclusive D.I.A. design ensures flawless fret crowning without damaging fret tops.
DURABILITY MEETS INNOVATION - Crafted from premium European tool steel with razor-sharp teeth for fast, smooth, and consistent finishes.
PRO LEVEL PERFORMANCE BEGINNER FRIENDLY - Engineered for luthiers yet intuitive enough for first-timers to achieve professional results.

The FretGuru Fret Crowning File °Dagger 2.0° is a professional-grade guitar luthier tool featuring an exclusive Dual Integrated Arc design for unmatched cutting precision and smooth finishes. Made from high carbon European tool steel, it offers dual-sided versatility for acoustic, electric, and jumbo frets. Ergonomically designed to reduce hand fatigue and prevent damage to your guitar, it delivers pro-level results that even beginners can master. Trusted by world-class luthiers and backed by rave reviews, this file redefines fret maintenance with speed, accuracy, and durability.

Specifications

ASIN	B08P81H8Q2
Body Material	Tool Steel
Color Name	Dagger 2.0
Customer Reviews	4.8 4.8 out of 5 stars (1,250)
Date First Available	13 March 2021
Item Weight	118 g
Item model number	FG-DSF-ML
Material Type	Wood
Power Source	Corded Electric
Product Dimensions	20.32 x 2.54 x 1.27 cm; 118 g

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