The classic choice for callus removal-- invented by Credo!The Credo Corn Cutter with clip-on rasp could be considered the 'classic instrument' from Credo. Easily sterilized and very unique, the exact alignment between the handle and the blade guarantees a maximum removal of 0.6mm of skin. The Credo Metal Corn Cutter comes with a clip-on rasp which helps smooth heels and rough patches of skin. This clip snaps on easily on the corn cutter's handle.