For a performance edge on the slopes, whether skiing or snowboarding, rely on DMT's Mini Diamond Whetstone sharpener. With just a few strokes of the diamond surface, you'll achieve clean and crisp edges. Compact, easy-to-carry only 70mm x25mm x 5mm. Kit of 3 stones include: Extra-Coarse diamond (60 micron / 220 mesh) when significant removal of material is needed for a damaged edge. Coarse diamond (45 micron / 325 mesh) to quickly restore a neglected edge. Fine diamond (25 micron / 600 mesh) for a razor sharp edge. No messy oils needed-use 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.