Sharpens hardened steel knives and chef's knives (e.g. global, sabatier) Even sharpens serrated knives (e.g. bread knives, hunting knives) Very safe one handed use, powergrip suction attaches securely to any flat surface, and requires only gentle pressure International products have separate terms, are sold from abroad and may differ from local products, including fit, age ratings, and language of product, labeling or instructions. Note Pull the tab on the sharpener down for the suction to engage.