4 Pieces Diamond Whetstone Grit, Diamond Plate Whetstone for Kitchen, Sharpening Dull or Tired Edges, 5.9 x 2.48 Inch (400/600/1000/1200 Grit)

Came on time and product is excellent

If you are looking for a starter set of sharpening surfaces these will work just fine. Get a bottle of automative glass spray and get on it. You may buy expensive oil stones and water stones later. This will get you going for a great price. I have been using them for a few months to sharpen wood working tools. Haven't seen any degradation yet.

Ich habe diese "Steine" auf Empfehlung von Rex Krueger beschafft und bin sehr zufrieden damit. Man sollte allerdings eine Unterlage einplanen, da sie sehr dünn sind.

They work well. The review form asked about "accuracy". I couldn't tell you how accurately flat these are, or if the grit is on spec. But they're handy and do the job. Some reviewers mention that these stones wear out fast. To those people I say "you're pressing way too hard, let the tool do the work". I'm sure mine will wear out eventually, but I've been using them for some time now with no deterioration. I'd say they're worth the price, and if you're particular about sharpness of your tools you will achieve it with this set.

I didn't read the product description so I didn't realise they were thin and one sided only (rubber backing). But I was able to sharpened some knives with good results (I'm not a pro) on some of them. I guess it depends on the knife's material.