1.This knob cutter are made of high quality manganese steel alloy, high intensity, strong tenacity and wearability. 2.Remove branches by leaving a small indented cut that heals with little or no scar. 3.Creates a spherical cut in a hollow concave shape that will heal with the least visible scaring and thus create a more pleasing aesthetic. 4.The concave cutter is ideal for removing small branches, protrusions and knobs by cutting into the wood at a concave angle. 5.Ergonomic handles gives you a comfortable hold and allowing continuous use without fatigue. Material: Manganese steel alloy Colour: Black Total length: about 210 mm/8.27 inches, tip: 20.6 mm/0.81 inches Opening: Approximately; 65 mm/2.56 inches, Maximum diameter/cut: 10 mm/0.39 inches Package weight: Approximately 216 grams Package includes: 1 x knob cutter