Koyo Bonsai Concave Cutters

Standard shears create a flat cut that can leave an unsightly bump as the tree heals. The concave design of these Koyo cutters removes a small amount of wood around the branch base, creating a slight indentation that allows the tree's callus tissue to grow over the wound flush with the trunk.

While the tool is 10.75 inches long, you should aim to cut branches that fit comfortably within the jaw's opening without forcing the blades. As a rule of thumb, never exceed the capacity of the jaw, and avoid twisting the tool while cutting to prevent blade damage.

Yes, the design is ambidextrous. The ergonomic handles and bypass mechanism function equally well regardless of which hand you use.

High carbon steel is prone to rust if left damp or dirty. After each use, wipe the blades clean with a soft cloth, remove any sap with a resin cleaner, and apply a light coat of camellia oil or machine oil before storing them in a dry place.

No, these cutters do not feature replaceable blades. However, because they are professional-grade Japanese steel, they can be professionally sharpened or honed by a skilled bonsai tool sharpener to maintain their edge for many years.