Convenient, lightweight and portable 4" x 1" Diamond Whetstone sharpener works well on knives, garden and specialty tools, etc. Convenient size measures 9 1/2" long when open and 5" when 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.