Ajikiri Kuro-Ochi - trimming knife
Aji means horse mackerel, a fish which is generally eaten quite small in Japan (about 6"), and it is for the filleting and delicate trimming of such small fishes, that these knives are intended, although commonly used also as a kind of general purpose parer. They should always be used in the hand or wooden and plastic board, and wiped and dried after use to protect both the hard carbon steel edge, and the wood of the handle. About 61 HRC. Blade about 13cm, overall length 24cm. You can find out about the use and care of these knives here.