The convenient pocket model 4" Diamond Whetstone™ sharpener comes with a protective leather sheath for easy access, allowing you to address a variety of sharpening, honing or filing needs on the go. This particular model features extra-fine diamond (9 micron / 1200 mesh) to polish and refine a razor edge after sharpening with a coarser diamond, and is sized with the highly-portable overall dimensions of 4 1/3" x 7/8" x 3/16". Thanks to its micronized monocrystalline diamond surface as well, you can sharpen edges faster and easier than conventional stones can. No messy oils are needed either, allowing you to sharpen dry or with water. Complete with a durable construction that will provide years of consistent performance and reliable service, professionals rely on the superior quality and versatility of DMT® products. Made in the USA.