# Best Knob Cutters for Bonsai Source: https://bonsainest.com/best/best-knob-cutters Updated: 2026-10-26 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. KAKURI Bonsai Knob Cutter with Sheath 7" Small - Made in Japan | Professional Bonsai Tool for Knob Removal, Concave Cutting, Trunk & Branch Shaping - Japanese High-Carbon Steel Blade Our score: 7.4/10 (Fit for the job 8/10 · Features and specs 7/10 · Build and materials 8/10 · Value 6/10) KAKURI 7 in small knob cutter with sheath, made in Japan from Japanese carbon steel. For removing bumps and shaping trunks and branches. Pros: - Made in Japan from Japanese carbon steel, with a razor sharp blade according to the listing - A sheath is included to protect the blade in storage - The manufacturer says it can be sharpened with a whetstone Cons: - At about $79 it costs far more than generic knob cutters - Small 7 in size suits fine work, and heavy branches may need a larger cutter Details: https://bonsainest.com/product/B08JK7TVJL ### 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. 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 ### 7. 8.5 Inch Bonsai Cutter Tool Stainless Steel Sharp Round Edge Knob Cutter for Bonsai and Gardening (Black) Our score: 6.8/10 (Fit for the job 7/10 · Features and specs 6/10 · Build and materials 6/10 · Value 8/10) An 8.5 in stainless steel round edge knob cutter in black. A low-cost beginner option for removing branches and small bumps. Pros: - Round edge produces a concave cut so sap can cover the wound, according to the listing - Forged stainless steel, listed as rust resistant - Ergonomic curved handle is listed to reduce hand fatigue Cons: - Unknown brand and the product page gives no steel grade or origin - Priced as a budget tool, so expect basic finishing compared to Japanese forged cutters Details: https://bonsainest.com/product/B0H69B7V4Q ### 8. Bonsaiboy Spherical Knob Cutter Our score: 6.7/10 (Fit for the job 8/10 · Features and specs 5/10 · Build and materials 7/10 · Value 6/10) Bonsai Boy spherical knob cutter, 8 in, listed as high carbon steel and razor sharp. For removing branches flush to the trunk. Pros: - Spherical head is designed to cut branches off flush to the trunk - Listed as high carbon steel and razor sharp - From a bonsai specialist seller, with an 8 in size stated Cons: - Less detail than the earlier Masakuni listing, and no maker or origin is stated for the cutter - The listing gives a weight of 3 lbs, which may be a shipping weight rather than the tool weight Details: https://bonsainest.com/product/B002C6DXW2 As an Amazon Associate I earn from qualifying purchases.