Spyderco Tri-Angle Stone Diamond Knife Sharpening System. This Knife Sharpener from Spyderco are steel triangles that have been blanketed in a bonding agent then covered in diamond particles for amazing efficiency. The Spyder Co. Sharp-Maker Diamond Triangle Knife Sharpener recommends diamond hard abrasives when you wish to remove stock for restoration purposes and to aggressively re-shape re-bevel and re-profile a cutting edge. This SpyderCo Sharpener can be cleaned using only fresh water. For a great way to ensure the continued sharpness of your favorite knives choose the Spyderco Triangle Steel Diamond SharpMaker Knife Sharpening System. Features of SpyderCo Triangle Steel File for Knife Sharpening: Blanketed in a bonding agent Covered in diamond particles Diamond hard abrasives are recommended Package Contents: Spyderco Tri-Angle Stones Knife Sharpening System These accessory diamond-impregnated steel triangles fit your Tri-Angle Sharpmaker base and are ideal for re-profiling edges putting edges on exceptionally dull knives and sharpening ultra-hard blade steels. Sold as a pair. 7 X 0.5 (178mm X 13mm)