Updated review: I bought a few of these in 2014 when they were about $3 each, but it's 2020 and they are between $8-$9. When sharpening really blunt knives, they wear out very quickly at the base of the V-groove and then only blunt the blade very much. I'd say they're good if you're on a nature trip to *sharpen a dull pocket knife, fishing knife, or a camp kitchen knife. It's easy to use even if your hands are stiff, dry/cracked or just injured from cold, wind and overuse. It's also small and light enough for an emergency kit. The hole is too narrow for most outdoor and camping knives, which typically have blades 3/16" to 1/4" thick. For use in the home kitchen, I would recommend looking out for something that will sharpen dull knives faster and for longer.
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