Diafold® Diamond Chainsaw Files are specialized for quick and easy chainsaw maintenance as well as being honing steels for sharpening any curved edge. Convenient folding plastic handles also protect the diamond surface while not in use, with this particular model featuring coarse diamond (45 micron/ 325 mesh) to quickly restore neglected edges. Also sized at 5/32" - 9" open and 4" closed, its portability is just as great as its versatility. Thanks to the micronized monocrystalline diamond surface as well, sharpening is much faster and easier than doing so with a traditional stone. No messy oils are needed either, so toy can sharpen dry or with water. Complete with a durable construction that will provide years of consistent performance and reliable service, woodworkers, chefs and other professionals rely on the superior quality and versatility of DMT products for proper tool maintenance. Made in the USA.