DMT W250CX-WB 10-Inch Coarse/Extra-Coarse DuoSharp Bench Stone with Base - BlackSharpens knives faster than conventional stones with DMT's micronized monocrystalline diamond surface No oil is needed sharpen dry or with water Durable construction will provide years of performance and reliable service International products have separate terms, are sold from abroad and may differ from local products, including fit, age ratings, and language of product, labeling or instructions.