Accusharp, Sturdymount, Knife Sharpener, Mounts Easily To Cutting Boards, Kitchen Counters, Filet Boards, Workbenches, Butcher Blocks, Cleaning Tables, No Messy Oils Or Stones, Diamond Honed Tungsten Carbide Sharpening Blades Are Reversible & Will Give An Excellent Sharpening Finish For 5 To 10 Years In Normal Household Use, Durable ABS Plastic Body & Stainless Steel Screws Make It Ideal For Indoor & Outdoor Use.