Block knife sharpener lifetime guarantee. Block Knife Sharpener are a New patent America made Knife Sharpener That is made to hones up original cutting edges, Great for Sharpening Kitchen knives, Pocket knives, Scissors and is safe to use for Sharpening Collectible knives and your best Hunting Knives. Block knife sharpeners are made to flex so it reline and hone knife back to it’s original cutting edge’s. Block knife sharpeners take very little skill to use.. and it will keep your knife sharp like the day you bought it.Block knife sharpeners do need some edge to work with. (not for flatten out or fixing destroyed edges). You have a half way descent edge on knife . You should have no problem getting very sharp. Knives can only get sharper when drawing blades threw. Will not lose whats already there.