Block knife sharpener offers a lifetime guarantee. Our Knife Sharpeners are a patent Knife Sharpeners made to hone blades back to their original cutting edges. Great knife sharpener for Sharpening Kitchen knives, Pocket knives, Scissors and your best Hunting Knives. Block knife sharpeners honing rods are made to flex so it picks up and reline 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 halfway descent edge on knife . You should have no problem getting shaving sharp.