Our handmade Yoshihiro Aonamiuchi Blue Steel knives are crafted with extraordinary skill by our master artisans. Aoko Blue Steel #1 with a hardness on the Rockwell scale of 63 to 64, is intricately forged with iron to create beautiful wave like patterns. It takes a very high degree of skill to create knives of exceptional performance with such exquisite beauty. Namiuchi means wave forged, and our master artisans blend aesthetics with the highest quality materials and and craftsmanship. Our Yoshihiro Aonamiuchi Blue Steel knives are complimented with a traditional Japanese style handcrafted Yew tree wooden handle affixed with a Water Buffalo horn bolster, and a protective wooden sheath called a Saya is included, which protects the knife and adds to its appearance when not in use. The Kiritsuke knife is a traditional Japanese all purpose chefs knife that resembles a sword. Its length allows it to cut sushi and sashimi like a Yanagi, and the wideness of the blade gives it the dexterity to do multiple jobs. The sword tip also helps balance the weight of the knife and can be used for intricate and precise knife work for excuisite service. Even the simplest of tasks are elevated with a handcrafted knife that is as beautiful as it is functional.