Knob Cutter 8" made by Samurai bonsai tools.
The biggest reason to have a knob cutter is for when you cut a branch off a knob cutter indents or leaves a concave so that it heals over properly. It's very important to leave as little scar as possible. Knob cutters are also designed for removing unsightly knobs from trunks and branches without leaving ugly scars, as well as for removing roots.
- Knob Cutter 8" Samurai bonsai tools