Professional grade bonsai tool set, 11 pieces, NMK-11
Eleven matched pieces for trimming, roots, structure and wire — a working set for shaping trees, ready for the bench from day one.
View productProfessional Bonsai Knob Cutter
Professional Bonsai Knob Cutter
For clean concave work on trunks and roots, this 180mm bonsai cutter combines a round cutting edge with the durable character of 4cr13mov bonsai tools, making it a practical choice for shaping, stub removal, and repotting tasks.
Specifications at a Glance
The product page lists this knob cutter in three overall lengths: 180mm, 205mm, and 290mm. It is a TianBonsai professional grade tool made from 4Cr13MoV alloy steel, with a sanding surface treatment and an edge hardness of HRC55 achieved by high frequency coil quenching.
The listing presents the item as a single knob cutter product with selectable length options. The material and hardness details are the key specifications to compare before ordering. The page also shows a rating of 5.0 from 628 reviews and a sold count of 2456, which are visible customer signals on the listing.
| Type | Knob cutter |
|---|---|
| Brand | TianBonsai |
| Quality | Professional grade |
| Material | Alloy steel (4Cr13MoV) |
| Overall length | 180 / 205 / 290 MM |
| Surface Treatment | Sanding |
| Edge Hardness | HRC55, quenching by the high frequency coil |
| SKU | Knob Cutter |
| Price shown | $22.85 |
| Rating shown | 5.0 (628 Reviews) |
| Sold count shown | 2456 Sold |
| Selectable options | 180mm / 205mm / 290mm |
Choosing the Right Knob Cutter
Because the same knob cutter is offered in 180mm, 205mm, and 290mm lengths, the main decision is the overall size that suits your working style and the scale of the tree. If your work leans toward smaller detailed cuts, the 180mm length is the shortest listed option; if you prefer a longer tool profile, 205mm and 290mm are the other listed choices. All three lengths share the same listed material, surface treatment, and HRC55 edge hardness, so the choice is about overall length rather than a change in steel or finish.
For buyers comparing a single tool with a set, the product matrix below shows a professional grade 11-piece set, an 11-tool case, and a 7-piece tool roll as separate catalog options. This knob cutter is the focused choice when the task is a concave cut on a burl, root burl, or protrusion; a set is the broader choice when several tool types are needed.
Confirm the exact option before ordering. Review the product page for the current price and options, or contact us with questions about the 180mm, 205mm, and 290mm choices.
Where This Knob Cutter Is Used
The product page describes a round concave edge for cutting bonsai tree burl and root burl and for making a circular concave incision. The curved and beveled blades create a concave wound, a shape intended to let callus tissue rise and heal evenly from the edges inward and reduce visible scars. The page also notes that tree sap can cover the incision during healing and help produce a smooth result.
- Removing branch collars or stubs after large branches are removed.
- Shaping the trunk line by removing protrusions or deformed parts.
- Fine root trimming during repotting.
- Initial carving as a starting point for hollowing, deadwood (jin), or bark peeling (shari).
These tasks all point to controlled wood removal rather than general pruning. The tool is described for bonsai work where the cut shape matters, especially around trunk and root areas that will be seen as the tree develops.
What to Check Before Ordering
Before ordering, confirm the selected length: 180mm, 205mm, or 290mm. Check that the product is listed as a knob cutter from TianBonsai, made from 4Cr13MoV alloy steel, with a sanding finish and an edge hardness of HRC55. The page also lists a price of $22.85, a 5.0 rating from 628 reviews, and 2456 sold, so those details should be read together with the current option and price shown on the product page.
The page includes care notes: the blades are very sharp; do not cut dry branches; clean dirt from branches before pruning; protect the tool tip; and clean and maintain tools after work. Because the listing describes a sharp cutting tool, handle it carefully and follow the published care notes.
For order support, use the product page to choose the length and quantity, then add to cart or buy now. For questions about the product or the best option for your bonsai work, use the Contact Us page.
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View productFrequently Asked Questions
What lengths are available for this knob cutter?
the listed options are 180mm, 205mm, and 290mm. select the required length before adding the tool to the cart.
What material and hardness are listed?
the product page lists 4cr13mov alloy steel, a sanding surface treatment, and an edge hardness of hrc55 achieved by high frequency coil quenching.
What is a round concave edge used for?
it is described for cutting bonsai tree burl and root burl and for making a circular concave incision. the curved and beveled blades create a concave wound intended to help callus tissue heal evenly.
Which bonsai tasks does the page list?
the page lists removing branch collars or stubs after large branches are removed, shaping the trunk line by removing protrusions or deformed parts, fine root trimming during repotting, and initial carving for hollowing, deadwood (jin), or bark peeling (shari).
What care notes are shown for the tool?
the page notes that the blades are very sharp, dry branches should not be cut, dirt should be cleaned from branches before pruning, the tool tip should be protected, and tools should be cleaned and maintained after work.
How do i order or ask about the product?
choose the 180mm, 205mm, or 290mm option, set the quantity, and use add to cart or buy now on the product page. for questions, use the contact us page.
