Block knife sharpener lifetime 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 most valued Hunting knives. Our Knife sharpeners has a patent flex made it the sharpeners handle design that able the honing rods we use in them to adjust to your knife original cutting edges. This hones your best blades to a shaving sharp finish. If your not sure how to use our sharpener? We have how to video’s on our website and our You-Tube site. (Block Knife sharpener) Our Website is molded in the Knife sharpeners handle in fine print.