Take your sharpening anywhere with the ready-to-go Dia-Sharp credit card sized diamond sharpener. Each one fits easily in pocket or wallet. Each comes in convenient vinyl color-coded carry case. Kit of 3: 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 (9 micron / 1200 mesh) to polish and refine a razor edge after sharpening with a coarser diamond. Each: 3 1/4-inch x 2-inch x .05-inch 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.