This razor sharp tool is designed for cutting branches flush to the trunk. The resulting wound can then heal over quickly with very little scarring. Will keep a sharp edge indefinitely when properly used and cared for. The Concave Cutter is the single most important tool for bonsai use and for which there is no substitute. This 8" version is considered the basic size. Product shipped may be slightly different in appearance than the cutter pictured, but will 8 inches long and function as described.