Corn plane with stainless steel blade and 10 spare blades. How to use: Soften the skin in warm water. Hold the corn plane against the corn or callous so that the edge of the blade is in contact with the hard skin. Carefully pare down the hard skin using slow light strokes to remove fine layers of dead tissue. Blade replacement: To change blade pull metal ridge of base plate towards handle. Insert new blade and push back to secure.