Master Grade Premium Knife Sharpener Bundle Deal with Japanese Usuba Knife It works for recurved blade (aka hawksbill or tourne blade, by moving the machine following the knife angle, the only one that can do it in the market) Will sharpen your knife sharp, so you dont have to throw away your dull knives Re-profile blade to restores bevel/extends cutlery life up to 10 times Premium Soft stone technology minimizes burr Angle guides maintain 15 blade edge