Masters Grade Stainless Spherical Bonsai Knob Cutters by Koyo Tools 8.25"
Knob Cutters are designed for removing unsightly knobs from trunks and branches without leaving protruding callous when the cut heals. They can also be used to further hollow out the cut after a concave branch cutter is used.
Be careful not to overdo it with your knob cutter, they can take out more material than you expected
Though not usually a beginner's tool, most bonsai mavens wouldn't be without one.
Koyo Masters Grade Bonsai Tools are known for quality materials and craftsmanship. When you hold them in your hand, you can feel and see why they are call Masters grade
Made in Japan by Koyo, a quality tool maker