DMT FME 1-Inch x 4-Inch Extra Fine -InchMachinist-Inch Diafold Diamond Whetstone Portable, light-weight with convenient fold & go handles, which enclose and protects the Diamond Whetstone" when not in use Two sided: Extra-Fine diamond to polish and refine an edge and Fine diamond for a razor sharp edge Sharpens knives and tools faster than conventional stones with DMT's monocrystalline diamond surface No oil is needed-sharpen dry or with water Durable construction will provide years of consistent performance and reliable service Real diamond sharpens steel, carbide, ceramic, or any hard material Unique interrupted surface is self-clearing to speed sharpening Diamond sharpening stone stays flat Use with water as a lubricant (or use dry); NO honing oil needed Customer Satisfaction Guaranteed <a href="https://www.amazon.com/b?node=14770868011"> International products </a> have <a href="https://www.amazon.com/gp/help/customer/display.html/ref=nav_cs_help?ie=UTF8&nodeId=202045290"> separate terms, </a> are sold from abroad and may differ from local products, including fit, age ratings, and language of product, labeling or instructions. Manufacturer warranty may not apply <a href="https://www.amazon.com/b?node=14770868011">Learn more</a> about Amazon Global Store.