A portable enhancement to any tool kit is the Mini Diamond 70mm stone in DMTs signature polka-dot pattern. Kit of 3 comes in Coarse (45 micron / 325 mesh) to quickly restore a neglected edge; Fine (25 micron / 600 mesh) for a razor sharp edge; Extra-Fine (9 micron / 1200 mesh) to polish and refine a razor edge after sharpening with a coarser diamond. Size: 2 11/16 x 15/16 x 3/16 Sharpening with diamonds is fast and easy. 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.