Block’s sharpeners are a new patent knife sharpeners for sharpening serrated knives. Sharpen Kitchen knives, Pocket knives, and safe to use on your best Hunting knives. Block Knife Sharpener are a New Patent American made knife sharpener that is quick and simple to use. Have no fear of losing your knives original cutting edges. Or what’s already there. Block knife sharpener has a patented flex design made to pick up on any knifes original cutting edges. Takes very little to no steel off knife, Yet you will get razor sharp quite fast. We have how to videos on sharpening different kinds of knives and cutting edges on our website and on our YouTube site. We sharpen serrated edge pocket knives, Kitchen knives, Scissors, Swords, Hatchets, and lots of odd shaped cutting edges that other sharpeners can not sharpen on our You-tube site. When we push a blade to cut we apply force. But not a equal force produces equal pressure. Pressure is force applied over a given area, and it is pressure at the cutting surface that makes the difference. If you cut with a sharp blade and a blunt blade, using the same force with each. The sharp blade has a much smaller surface area than the blunt blade. Knife sharpeners for serrated.