A dull knife in the kitchen can easily ruin any meal. Extend the life of the knife by using our combination sharpening stone. Coat each side with mineral oil to lubricate the knife, creating a slick, slippery surface easing the sharpening process. Use the medium grain side first to remove surface material from the blades edge, then smooth and sharpen the edge with the fine grit side. This compact-size combination sharpening stone is perfect to sharpen smaller or thinner knives such as the paring knife, utility knife and the boning knife. Keep one stocked in your drawers for convenient access. Requires mineral oil for use.