D2 is an older, proven tool steel, relied upon in industrial settings for making some of the most durable cutting and metal forming tools possible. It's hard, wear resistant, tough and makes an extremely long-lived and edge-holding knife blade. It also has enought chromium in it to be called "almost" stainless. When you want a knife edge to last and last D2 can offer a supreme cutting edge, and a fantastic knife that will last for many generations.