# Best Knob Cutters for Bonsai Source: https://bonsainest.com/best/best-knob-cutters Updated: 2026-09-14 Publisher: Bonsai Nest. Our score is an editorial rating out of 10 (fit 35%, features 25%, build 20%, value 20%), not a customer rating. Method: https://bonsainest.com/how-we-research#our-score Knob cutters have rounded, spherical jaws that scoop a shallow hollow out of a trunk, which is what you want when removing a stub, an old knuckle, or a lump left behind by a previous cut. They work where the flatter bite of a concave cutter would leave a dip in the wrong shape. What varies is jaw diameter, the depth of the scoop, the steel, and the leverage the handles give you. We weighed cutting force on hard old wood and whether the jaws stayed aligned after repeated heavy use. Sharpening access mattered too, since curved edges are harder to restore than straight ones. Smaller heads suit shohin and detailed cleanup around fine branches. Large heads suit collected trees, thick trunks and reduction work. Growers who mainly refine finished trees rarely need the biggest sizes. ## Picks ### 1. Wazakura Hand Forged Knob Bonsai Cutter Made in Japan 8-1/4 inch (210mm), Round Edge Concave Branch Cutter Black Our score: 8.6/10 (Fit for the job 9/10 · Features and specs 8/10 · Build and materials 9/10 · Value 8/10) Wazakura's hand forged knob cutter made in Japan, 8-1/4 inch (210mm), with a round edge concave head in black. Pros: - Hand forged Japanese steel gives crisp, controlled bites - 8-1/4 inch length suits most branch and knob work - Round edge head doubles as a deep concave cutter Cons: - Black carbon steel needs cleaning and oiling after use - Round jaws can take more wood than needed in careless hands Details: https://bonsainest.com/product/B0849XFP6X ### 2. SPEEDWOX Bonsai Branch Tool Kit - Concave and Spherical Knob Cutters, Black, Ambidextrous, Stainless Steel Blades, 210mm Length Our score: 8.4/10 (Fit for the job 9/10 · Features and specs 8/10 · Build and materials 7/10 · Value 9/10) SPEEDWOX's bonsai branch tool kit with concave and spherical knob cutters, 210mm, stainless blades and ambidextrous grips. Pros: - Two cutters cover both flush branch cuts and knob removal - Stainless steel blades resist rust with little maintenance - Ambidextrous design suits left-handed growers too Cons: - Stainless steel is usually softer than good carbon steel - No case included for storing the pair Details: https://bonsainest.com/product/B0CBJRCXCX ### 3. Masakuni Bonsai Tool Spherical Knob Cutter, Small (8336) Our score: 8.3/10 (Fit for the job 9/10 · Features and specs 7/10 · Build and materials 10/10 · Value 7/10) Masakuni's small spherical knob cutter (8336), a premium Japanese tool for removing knobs and stubs on small trees. Pros: - Masakuni is one of the most respected Japanese bonsai tool makers - Spherical jaws scoop out knobs for smooth, fast-healing wounds - Small size is precise on shohin and refined branches Cons: - Premium price is high for growers with only a few trees - Small size lacks the bite for large trunk knobs Details: https://bonsainest.com/product/B00OPUMPRC ### 4. BambooMN Bonsai 8 inch Knob Cutter Tool - 1 Piece Our score: 7.3/10 (Fit for the job 8/10 · Features and specs 6/10 · Build and materials 7/10 · Value 8/10) BambooMN's 8 inch bonsai knob cutter tool, a single mid-range cutter for stub and knob removal. Pros: - 8 inch length gives balanced control and leverage - Mid-range price is fair for a dedicated knob cutter - BambooMN is a common bonsai tool brand with spare options Cons: - Basic steel on budget cutters may need more frequent sharpening - Single tool, so a concave cutter must be bought separately Details: https://bonsainest.com/product/B086696SNC ### 5. TOPINCN Bonsai Tool Branch Cutter Stainless Steel Garden Knob Cutter Concave Cutter Gardening Tool 210mm (8.26 inch) Our score: 7.2/10 (Fit for the job 7/10 · Features and specs 7/10 · Build and materials 7/10 · Value 8/10) TOPINCN's stainless steel knob and concave cutter, 210mm (8.26 inch), for general bonsai branch work. Pros: - Stainless steel stays cleaner and rust free than carbon tools - 8.26 inch length handles most hobby branch removal - Combined knob and concave style reduces tools needed Cons: - Stainless edge dulls sooner than hard Japanese carbon steel - Generic build lacks the fine jaw fit of premium cutters Details: https://bonsainest.com/product/B07NNH8ZHF ### 6. TinyGreen Japan Bonsai Tool Professional Grade Japanese Spherical Knob Cutters Our score: 7.1/10 (Fit for the job 8/10 · Features and specs 6/10 · Build and materials 7/10 · Value 7/10) TinyGreen's professional grade Japanese spherical knob cutters for removing stubs and bumps on bonsai. Pros: - Spherical head bites into wood to hollow out old stubs - Professional grade label suggests better steel than hobby cutters - Useful for cleaning up trunk scars after branch removal Cons: - Check the jaw opening size against your typical branch diameter - Less well-known brand than established Japanese makers Details: https://bonsainest.com/product/B01GGSJQTK ### 7. VIGAN 210mm Round Edge Concave Knob Branch Cutter Garden Bonsai Tools Shears Scissors Our score: 6.8/10 (Fit for the job 7/10 · Features and specs 6/10 · Build and materials 6/10 · Value 8/10) VIGAN's 210mm round edge concave knob branch cutter, a budget tool for knobs and branch stubs. Pros: - Round edge jaws remove knobs and make deep concave cuts - 210mm length is a comfortable size for most trees - Low price for a tool that covers two cutting jobs Cons: - Budget steel on tools like this may dull faster than premium - Mixed garden shears naming makes its purpose less clear Details: https://bonsainest.com/product/B093T1F33G ### 8. Knob Cutter Bonsai Tools Round Cutter Stainless Steel Beginner Concave Cutter Gardening Tool 210mm Our score: 6.8/10 (Fit for the job 7/10 · Features and specs 6/10 · Build and materials 6/10 · Value 8/10) A beginner stainless steel round knob cutter, 210mm, doubling as a concave cutter for bonsai branch removal. Pros: - Beginner-friendly price for a first knob cutter - Stainless steel is forgiving if not dried immediately - 210mm size is versatile across small and medium trees Cons: - Fit and finish quality can vary between production batches - Beginner-grade jaws may crush rather than cleanly slice Details: https://bonsainest.com/product/B07TBCCZHQ As an Amazon Associate I earn from qualifying purchases.