The ever ready corn and callous trimmer removes hard skin, callouses and corns leaving skin soft and smooth. Only use ever ready corn and callous trimmer replacement blades. Directions: Before use, soften the corn or callous in warm water. Then hold the corn and callous trimmer against the painful area and carefully pare down the hard skin with thin shavings. The space between the blade and the blade protector is graduated. Light paring is best done with the area close to the handle, for heavy paring use the area close to the blade's point. Compatible with the Boots Corn & Callus Trimmer and blades