For professional results, regardless of skill, depend on DMT Aligner Kits and Accessories. The Aligner Pro Kit includes 3 - 4-Inch stones, coarse, fine and extra-fine diamond grits and a fine diamond serrated sharpening accessory. All are stored in a compact, durable plastic kit box. Use the coarse diamond (45 micron / 325 mesh) to quickly restore a neglected edge. The fine diamond (25 micron / 600 mesh) for a razor sharp edge and the extra-fine diamond (9 micron / 1200 mesh) to polish and refine a razor edge after sharpening with a coarser diamond stone. 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. Made in USA.