Convenient, lightweight and portable 4 x 1 diamond whetstone sharpener. Multi use on scissors, knives, garden tools, and specialty tools with the added milled groove to sharpen hooks. 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. DMT Diafold Hook and Knife Whetstone Sharpener Fine Diamond