These Premium Quality OSUKA Bonsai Knob Cutters are designed to easily remove awkward stumps, jins and thick roots from your bonsai. At 180mm in length, the Shohin range of OSUKA Tools are specifically designed for small Shohin trees. The Japanese inspired design presents a superior comfort grip with the power and strength you would expect from top quality bonsai knob cutters. The High Grade Carbon Steel engineering is built to last a life time. The best value High Quality Carbon Steel Bonsai Knob Cutters available today. Black finish. The Carbon Steel range of OSUKA Bonsai Tools are manufactured in Southern China using High Grade Carbon Steel imported from Japan.