Super Water grindstone for all kitchen knives

I bought this W-stone on Amazon and it is really great to grind any kitchen knives.
Man needs a little practice this but one has it right heraußen how to use it, before you start giving the stone into the water for 20 minutes.
Video in YouTube the first knife is a little getting used to but after that it's very
well then.
Roughing blunt blades with the 400 and then refine the 1000s.
TOP grindstone I would buy again ...