Length: 9-1/2" Open, 5" ClosedStone Size: 4-5/16" Long X 7/8" WideGrit: Fine (25 Micron, 600 Mesh)Surface: Interrupted DiamondUse To Put A Great Edge On Slightly Dull Knives Or ToolsSingle Sided Diafold Sharpener Provides Convenient, Lightweight And Portable Sharpening For Knives, Garden, Specialty Tools And MorePattern Holes Are Slightly Recessed In Order To Collect Metal Fines Removed During SharpeningFold And Go Handles Enclose And Protect The Diamond Whetstone When Not In UseNo Oil Is Needed, Simply Sharpen Dry Or With Water