Various steels, coarse to fine.
You don't need them all, this is an interest and opportunistic to buy an sale etc
A nice fine steel is all you need if you can hand sharpen on a fine Aluminium Carbide stone.
Some mass produced stainless knives sharpen easily. But they have to have some quality and characteristics.
Cheap supermarket kitchen knives are hard and brittle.
F.Dick, Victorinox seem user friendly to me. Some quality brands are harder steel with good edge retention once you get there.
Some customs like Carbon Steel are user friendly , some are of a higher hardness.
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