Diamond Mini-Sharp® Sharpener - a Diamond Whetstone that travels with you. Folding handle protects the stone when not in use. Lightweight and ultra portable, handy key chain swivel ring for your keys or attach to zipper pulls or backpacks. Extra-Coarse diamond (60 micron / 220 mesh) when significant removal of material is needed for a damaged edge. Handy Size: 5 1/2" opened. Size: 2 11/16" x 15/16" x 3/16". Sharpening with diamonds is fast and easy. No messy oils neededsharpen 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.