StewMac Fret Kisser with Understring File Set - Fast Spot Fret

Our review of the StewMac Fret Kisser with Understring File Set concludes that this is a specialist tool for anyone who regularly does fret maintenance and needs a fast fix for a single high fret. The biggest reason to buy is speed: it levels one offending fret instantly without removing strings, turning what used to be an hour of setup into a minute or two. Built from thick steel and backed by StewMac's lifetime promise, it is aimed at professionals and serious players who value precision and repeatable results.

Key Features

• Built to last: Durable 0.255in thick steel construction with a non-reflective finish gives stability and long life for repeated shop use.
• Spot leveling: The Fret Kisser can accurately level a single high fret without affecting adjacent frets, saving time on partial repairs.
• Understring file included: The set includes a 20-degree understring fret dressing file so you can crown frets without removing strings and get playing-ready results immediately.
• Diamond-coated edges: Four 300-grit diamond-coated sides provide controlled material removal so only the problem area is addressed.
• Fast and precise: The tool's design allows pinpoint accuracy and quick correction, ideal for road crews or techs doing on-the-spot fret work.
• Lifetime promise: StewMac backing offers long-term reliability and confidence for professionals investing in their toolkit.

Who It's For

The Fret Kisser is best for guitar techs, luthiers, road crews and serious players who encounter isolated high frets and need a quick, reliable repair without full fret dressing. Its precision and durable build make it a practical shop tool when time and playability matter.

It is less suited to someone who never performs fretwork or who needs full-scale fret leveling across an entire neck; a traditional leveling and crowning setup remains the right choice for complete refrets or broad re-profiling jobs.

Pros & Cons

Pros

• Precision spot-leveling that saves time compared with full fret jobs.
• Includes an understring 20-degree file for crowning without string removal.
• Sturdy 0.255in steel construction and non-reflective finish for stable use and long life.
• Diamond-coated surfaces deliver consistent, controlled material removal.

Cons

• Specialist-purpose tool; not a replacement for a full fret-leveling and re-crowning setup.
• Some users may debate value, as opinions on cost versus frequency of use vary.

Specifications

Brand	StewMac
Tool type	Spot fret leveling and dressing kit
Material	0.255in thick steel with non-reflective finish
Abrasive	300-grit diamond-coated on four sides
Understring file	20-degree fret dressing file included
Use	Level single high frets without removing strings
Warranty	StewMac lifetime promise

Our Verdict

The StewMac Fret Kisser with Understring File Set is a smart buy for professionals and serious hobbyists who need a fast, reliable way to fix solitary high frets and keep guitars playing on the spot. Its durable construction, precise diamond edges and the included understring file make it good value for users who will use it regularly; casual players who rarely touch frets may find a full leveling setup more appropriate.

Frequently Asked Questions

Can it level a fret without removing strings?
Yes, the Fret Kisser is designed to spot-level a high fret while strings stay on, and the included 20-degree understring file lets you crown without string removal.

Is it suitable for all scale lengths?
Customers report it works well across different scale lengths, with the tool able to pinpoint and address individual problem frets on most guitars.

How durable is the tool?
Made from 0.255in steel with a non-reflective finish and diamond-coated surfaces, it is built for heavy shop use and covered by StewMac's lifetime promise.