Maximize the performance of your knives by properly maintaining the edge of the knife using the sharpening stone. The large surface is ideal for sharpening and maintaining larger knives such as chef knives, carving knives and even meat cleavers. Coat each side with mineral oil to lubricate the knife, creating a slick, slippery surface easing the sharpening process. First use the medium grain side, to remove dull surfaces or nicks, and then smooth the blade on the fine grain side. This combination sharpening stone works well with stainless steel and high-carbon German steel knives. Requires mineral oil for use.