The Japanese word Gyuto (牛刀) literally translates to beef sword. The gyuto is the equivalent of the Western chef's knife, and is designed to cut everything: vegetables, meats and fishes. It is made to be used with the push-cut method, lifting the blade between each cutting motion, or with the rocking motion method. It is important that the blade is straight upon impact with the cutting board to avoid damage to the knife edge.
Shirogami #1 by Hitachi steel co translates to white steel #1 and is an improved version of Shirogami #2 as it contains a higher carbon content. It is named after the color of the paper in which it is packaged once produced. It is considered one of the purest steels, after Tamahagane, which allows for a sharper edge than most other steels. However, it will generally be more brittle and can break more easily due to misuse. Mastering the forging of shirogami #1 to exploit its full potential is not simple and requires an expertise that few blacksmiths have. It is in the process of making a Mizu Honyaki type knife that you will find the shirogami #1 in its most difficult to forge version, but also the sharpest.