Diamond-coated surface. Multi-functional leather sheath. The tool is forged from 0-1 tool steel with chromium carbide treatment. The edges are designed to put the first edge on a dull blade. The flat surface is used to hone the blade even sharper. The leather sheath is used for stropping to put the final edge on the blade. Added features include a groove for sharpening fish hooks and the end of the tool is shaped into a chisel edge. Overall Length: 9.81 in. Weight: 5.4 oz. Sheath: Leather.