Accusharp Knife Sharpener that mounts easily to cutting boards, kitchen counters, filet boards, workbenches, butcher blocks, cleaning tables, etc. No more messy oils or stones. Diamond Honed Tungsten Carbide sharpening blades are reversible and will give you an excellent sharpening finish for 5 to 10 years in normal household use. Durable ABS plastic body and stainless steel screws.