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This knob cutter has a round concave edge, which is used to cut the bonsai tree burl and root burl, and will make a circular internal concave incision. In the healing process, tree's sap will cover this incision and let it heal quickly and excellently smooth Made of high quality Manganese Steel Alloy material, wear-resistant, anti-rust, high hardness, strong tenacity and very durable Remove branches by leaving a small indented cut that heals with little or no scar Creates a spherical cut in a hollow concave shape that will heal with the least visible scaring and thus create a more pleasing aesthetic Ergonomic handle for comfortable grip, Manufacturer: VIGAN