Chefs No. 1 and Office No. 1 are both first-rate chef's knives. Due to the complex heat treatment in vacuum, the blades achieve a hardness of 57 plus/minus 1 Rockwell, the guarantee for high sharpness and edge retention. The special sharpness of the knife is created by the best trained employees of GIESSER (their profession is cutting tool mechanic) in several stages. The ultimate finish is done by a master hand. The knives are also characterized by the design of the handles. The careful and sensitive processing of the handles make this knife especially easy on the hands. But beware! The knife is particularly sharp and should be used with the necessary respect. Such good knives should always be rinsed by hand and kept safely (out of the reach of children).