Professional Grade High Carbon Steel Knob Cutter

A knob cutter features a rounded, concave blade that allows you to cut into the wood slightly below the surface level. This promotes the tree's natural healing process, ensuring the bark grows back flat rather than forming an unsightly, protruding callus.

Yes, the concave design is highly effective for hollowing out existing cuts or scars on the trunk. This is particularly useful for creating natural-looking deadwood features or refining the shape of a wound to encourage better closure.

High carbon steel offers superior edge retention and sharpness, but it is susceptible to rust if left wet. To keep the tool in top condition, wipe the blades clean after every use and apply a light coat of camellia oil or a similar rust-preventative lubricant before storing.

Because of its powerful leverage and sharp blades, it is best to make small, incremental cuts rather than trying to remove the entire knob in one motion. Take your time to assess the depth of the cut as you work to ensure you do not remove more wood than intended.

While 11.5 inches is a standard professional size that provides excellent leverage for larger branches, it may feel cumbersome on very small, delicate shohin bonsai. It is best suited for medium to large bonsai where you need the extra force to cut through thicker wood.