DMT 4-in. Diamond Whetstone - Fine

This is a pocket-size 4-inch diamond sharpening stone that comes in a protective leather sheath for carrying in a pocket, pack, or tackle bag. It works well for hunters, anglers, and anyone who wants to touch up a pocket knife or outdoor blade away from home. The fine diamond surface (25 micron / 600 mesh) hones a razor-sharp edge, and DMT's micronized monocrystalline diamond cuts faster than conventional stones. No oil is needed, so you can sharpen dry or with water. DMT states on the product page: "Made in USA."