Convenient pocket model 4 Diamond Whetstone sharpener with protective leather sheath for easy access to a variety of sharpening, honing or filing needs. Extra-Extra Fine (3 micron / 8000 mesh) provides the finest polished edge of all bonded diamond abrasives. Size: 4 1/3 x 7/8 x 3/16 Sharpening with diamonds is fast and easy. No messy oils neededsharpen 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.