DMT is recognized as the worldwide leader in diamond knife sharpeners and sharpening products, with a diverse product line and reputation for quality and innovation. DMT's patented and award-winning products are known for their superior quality and versatility, are easy to use, and allow for sharpening in a fraction of the time required by other methods. DMT manufactures a full line of diamond knife sharpeners and other sharpening tools for use in woodworking, culinary arts, gardening, camping, fishing, hunting, outdoor and winter sports, industrial applications and more.From the ManufacturerDiamond 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. Coarse diamond (45 micron / 325 mesh) to quickly restore a neglected edge. Handy Size: 5 ½ opened. Size: 2 11/16" x 15/16" x 3/16". 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.