Spyderco Tri-Angle Stone Ultra Fine 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 This ultra-fine-grit accessory stone fits the Tri-Angle Sharpmaker base and puts an exceptionally fine scratch pattern on your edge for hair-popping sharpness. Designed to be used dry it is easily cleaned with household cleanser a scouring pad and water. Sold individually. Made in USA. 7 X 0.5 (178mm X 13mm)