Block knife sharpener life time guarantee. Block Knife Sharpener are a New patent America made Knife Sharpener, 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 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.