Sanmai(Three-Piece) is a common construction for double bevel knives where two pieces of softer cladding steel are forgewelded to each side of a harder core steel. The harder but more brittle core steel will form the hard cutting edge after heat treating, and the softer cladding will support the core to increase the overall strength of the blade.

The soft cladding enables the thinning process to be a lot easier than a honyaki or monosteel construction. And in the case where the cladding steel are stainless in nature, it can offer protection for the carbon or semi-stainless cores against rusting and discoluoring.

The "Tsuchime" finish in Japanese kitchen knives refers to a distinctive hammered texture on the blade's surface. This traditional technique not only adds a unique aesthetic appeal but also provides practical benefits, such as reducing drag and preventing food from sticking to the blade during slicing. It's a hallmark of craftsmanship that blends functionality with artistry, making each knife not only a tool but a piece of art.

Black Chacate is a highly valued timber known for its deep, rich brown to almost black coloration, fine texture, and exceptional durability. It polishes well, offering an exquisite finish that highlights its subtle, elegant grain patterns. This wood is often used in fine woodworking projects, including luxury furniture, decorative items, and high-end knife handles.

An octagonal wa handle made from Black Chacate wood would exhibit a sleek, geometric shape that fits comfortably in the hand, enhancing the user's grip and control. The deep hues and natural luster of Black Chacate add a touch of sophistication and unparalleled beauty to the handle, making it not only a functional component of a kitchen knife but also a piece of art. The durability and stability of Black Chacate ensure that the handle withstands the rigors of kitchen use while maintaining its aesthetic appeal over time.