This Corona AC 8300 Garden Tool is a blade sharpener I use all the time!

Check this affiliate link for the current price (Amazon): geni.us/f2fFW9e
Here is the info listed on the Amazon product listing:
Corona, AC 8300, Garden Tool, Blade Sharpener, 1-Pack, Red
About this item
IDEAL FOR SHARPENING ALL STRAIGHT BLADES: Excludes saw blades.
SMALL, CONVENIENT SIZE: Easily fits in a pocket or tool bag.
NON-SLIP GRIP FOR EASY USE: Rubber grip helps prevent slipping, keeping you safe while sharpening.
5" SUPER CARBIDE FILE: File is durable and designed to be comfortable to hold.
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[@markg6605]

I was wondering if you can use this on a lawnmower blade?

[@Pyro4Lyfe]

I love mine. I actually bought has a ferro rod striker but I sharpen everything with it lol

[@marmaly]

Nice to see someone using it correctly!