DMT F70E Diamond Mini Sharp Sharpener Extra Fine

Amazon

Ultra portable, Key chain sharpener Extra-fine diamond to polish and refine an edge Sharpens knives faster than conventional stones with DMT micronized monocrystalline diamond surface No oil is needed-sharpen dry or with water Durable construction will provide years of performance and reliable service, Weight: 0.08 Pounds, Manufacturer: Acme United Corporation

Cazaar

The DMT F70 Diamond Whetstone that travels with you. It has a flip open lid/handle and a swivel ring for a key chain. 140 mm when open, this is the perfect pocket knife accessory. Effective on the hardest stainless steel blades, tools and sporting goods. Handle folds easily for protected storage. Extra Fine.Green. 1200g. DMTF70E

Zoro Tools

Made with real diamond (monocrystaline). Easy to use - requires only light pressure to produce a keen edge. Uses water as a lubricant. Can be used to hone and sharpen steel, ceramics, glass, tungsten carbide, stone, etc. Mini-Sharp & Key Ring