Functionality: It's designed to sharpen knives by running the blade through the sharpening slots.
Design: The sharpener has a handle for grip and multiple sharpening slots, likely for different stages of sharpening or types of blades.
Material: Manual sharpeners often use abrasive materials like diamond or ceramic discs for sharpening and polishing.
Usage: It provides a way to maintain or restore the sharp edge of a knife for precise and safe cutting.