Professional Bonsai Tool 8" Stainless Steel Concave Cutter/Branch Cutter(SC200) This is a relatively large sized concave cutter and are ideal for working on large trees. Concave branch cutters are razor sharp tools designed for cutting branches flush to the truck. The resulting wound can be then heal quickly with little scarring. The concave cutter is the single most important tool for bonsai shaping for which there is no substitute. 8 X 1.5 X 1 inches