Jin 230mm High Speed Steel Ko-Yanagiba with Saya P-03 Oyster Knives it was designed to fit

it was designed to fit with a very specific type of Japanese container that is commonly found across Japan

but as you add water

The Kyokuha Diamond 400 is a solid coarse stone

You will notice that in between the softer carbon steel and harder High Speed Steel cutting edge

Jin 230mm High Speed Steel Ko-Yanagiba with Saya P-03 Oyster Knives it was designed to fitProduct Description Detailed Specs Measurements This high speed knife is one of a kind knife. The maker of the Jin knives was born in Tokyo before World War II and began making knives early on in his life. We met with him some years ago, during our first business trip to Japan. After a very nice meeting with him, we were lucky enough to be allowed to carry his knives. At the time we met him, he was already retired, so his knives are all new old stock