For professional sharpening results, regardless of skill, you can depend on DMT® Aligner™ Kits and Accessories. This kit includes three 4″ Diamond Whetstone™ in Coarse diamond (45 micron / 325 mesh) to quickly restore a neglected edge, Fine diamond (25 micron / 600 mesh) for a razor sharp edge, and Extra-Fine diamond (9 micron / 1200 mesh) to polish and refine a razor edge after sharpening with a coarser diamond stone; a Serrated Knife Sharpening Accessory Fine diamond to hone serrated edges; and fabric storage pouch in which to carry the Aligner™ components. Easy-to-follow instructions included. 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.