The Original Kleva Sharp; the worlds best knife sharpener, makes an old knife cut like new! Kleva Sharp Knife Sharpener restores a superb sharp cutting edge to any blunt, and dull knife blades. Our best selling knife sharpener works with all your knives – even serrated blades! The unique, patented design uses tungsten carbide technology to extend the life of almost any knife, and thanks to the suction cup base, your hands never go near the blade.