The AccuSharp SturdyMount Knife Sharpener mounts easily to cutting boards, kitchen counters, filet boards, workbenches, butcher blocks and cleaning tables. No more messy oils or stones. The diamond-honed tungsten carbide blades are reversible and will give you an excellent sharpening finish for 5 to 10 years of normal household use. A durable ABS plastic body and stainless steel screws make the SturdyMount Knife Sharpener ideal for indoor and outdoor use.