KIYOZURU 102 Japanese Bonsai Concave Cutter – 170mm High Carbon Steel Branch Pruning Tool

What is the KIYOZURU 102 Japanese Bonsai Concave Cutter used for?

This tool is designed for clean branch removal in bonsai, creating a slightly recessed cut that heals flatter and blends into the trunk. It’s ideal for precise, aesthetic cuts and reducing visible scarring—far superior to flat-pruning secateurs for bonsai work.

How is a concave cutter different from secateurs or knob cutters?

Secateurs leave flat cuts, while the KIYOZURU 102 makes a concave cut that promotes better healing. Knob or spherical cutters create deeper scoops for specialized use, but this cutter handles most branch removal needs with precision and control.

How thick of a branch can the KIYOZURU 102 cut?

It handles small to medium branches. If you need to force the tool, it’s too thick—use a saw first, then refine the stub with this cutter. Avoid using it on deadwood, roots, or gritty material to protect the blade.

What size is the KIYOZURU 102 and why choose 170mm?

At 170mm and about 110g, it offers excellent control and comfort for detailed work without fatigue. It’s a versatile size that suits most hand sizes and is well-balanced for both beginner and experienced bonsai growers.

What is the KIYOZURU 102 made from?

It’s crafted in Japan from high carbon steel for superior sharpness and edge retention. While carbon steel needs light maintenance to prevent rust, it offers far better cutting performance than lower-grade materials.

Can the KIYOZURU 102 be resharpened?

Yes. Use a fine diamond file or stone to follow the existing bevel. Sharpen the cutting edges only, and avoid flattening the concave shape. Touch up the blade when cuts start to tear rather than slice cleanly.

How do I clean and maintain the KIYOZURU 102?

After each use: wipe off sap and debris, dry thoroughly, and apply a light coat of oil. Avoid dishwashers. Clean sap quickly to prevent sticking. If it feels stiff, clean the pivot and apply a drop of oil.

Will the KIYOZURU 102 rust?

Like all carbon steel tools, it can rust if left damp. To prevent this, clean and dry it after use, then oil lightly. If rust appears, use fine steel wool or a rust eraser, then re-oil the surface.

How should I store the KIYOZURU 102 cutter?

Store it clean, dry, and lightly oiled in a low-humidity space. Leather rolls are fine if the tool is fully dry—otherwise, they can trap moisture. Avoid tossing it loose with other tools.

Is the KIYOZURU 102 beginner-friendly?

Yes—just avoid cutting branches that are too thick. It’s sharp and precise, making clean cuts with less effort. Beginners should practice making small, controlled cuts and avoid twisting or forcing the jaws.

Is the KIYOZURU 102 worth it compared to cheaper cutters?

If you value clean healing, edge retention, and long-term use, the KIYOZURU 102 is worth the investment. It’s made in Japan with quality steel and can be resharpened—unlike cheaper cutters that dull fast and need replacing.