The Alphin FirmGrip 560321 Commercial Grade Hand Held Knife Sharpener is a tool specifically designed for knife sharpening. This handheld sharpener falls under the category of hand tools, suitable for use in a commercial setting. The FirmGrip feature ensures a secure hold while sharpening knives, making it a practical and efficient choice for maintaining the sharpness of various types of knives. Its commercial grade quality indicates that it is durable and reliable for frequent use in professional environments.