Prefessional Kitchen Appliances Honing Oil is refined from mineral oil product and meets the requirement of food safety and environment protection. It is scientifically formulaten and excellent for lubricating the whestones and diamond stones with the high cutting efficiency surface.Using a whetstone without some kind of lubricant ,the pores will be clogged and could not sharpen proterty,and diamond stones can be sharpened with a lubricant for better performance.