(1) Sharpens stainless steel, carbon steel and much more. Excellent for a variety of knives and tools. It produces strong, keen, long-lasting edges on quality tools (2) This oilstone is used to restore cutting edges on straight-edged tools, such as chisels, knives, plane blades, and precision instruments. The stone is prefilled with oil to save time and eliminate the need to presoak it prior to use (3)- it is easy to control - a sharp knife make a nice clean cut - delicate ingredients look a lot fresher for a longer time if they have been sliced through cleanly - preparing food is faster and more fun with a sharp knife - a dull knife slow you down and easily spoil the food