A premium silicon carbide abrasive gives fast stock removal for quick edge shaping with minimal loading | Benchstones are ideal for hand dimensioning and sharpening of all types of knives, plane blades, chisels, scrapers, or any other tool that needs a flat, sharp edge | Coarse/Fine silicon carbide combination stone - for sharpening and finishing |The use of oil with sharpening stones enhance the sharpening action and minimize the clogging of the stone's surface.