The DMT Single Sided Diafold Whetstone Sharpener is a convenient, lightweight and portable 4" x 1" Diamond Whetstone™ sharpener. Multi-use on knives, garden and specialty tools, etc. Fine diamond (25 micron / 600 mesh) for a razor sharp edge. Convenient size: 9 1/2" open. 5" closed. Folding plastic handles protect sharpener when not in use. Sharpens in a fraction of the time required by conventional stones. No messy oils needed—sharpen dry or with water. Durable construction will provide years of consistent performance and reliable service. For proper tool maintenance, woodworkers, chefs and other professionals rely on the superior quality and versatility of DMT® products. Made in USA.