A blade sharpener is a tool used to sharpen the edges of blades, such as knives and scissors. It typically consists of four components: a honer, STEEL, STROP, and OILSTONE. A honer is a tool used to refine the edge of a blade by removing small amounts of metal. STEEL is a hard material used to sharpen blades. A STROP is a leather strap used to further refine the edge of a blade. An OILSTONE is a flat stone used to sharpen blades with oil.