AFAIK, those are always carbide cutters. Efficient, but not smooth.That Amazon post of a knife sharpener will make a knife sharp but will also need to be used again and again as it will remove a lot of steel from a blade and you do not get a smooth finish. I have used one decades ago when I was a teen and it was good in a pinch for kitchen knives.
On of the best 5 bucks I ever spent was on a ceramic sharpener from Harbor Freight. It has two ceramic rods mounted at a steep angle, and slightly forward/back from one another.
The space between the rods allows you to vary the angle of cut on the blade.
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