Foot destroyer! [SEP] This seemed wonderfully effective as it quickly filed down my worst calluses...until my toes started *bleeding*! It's basically a very sharp cheese grater being sold as a foot file--and so sharp that it makes clean "slices" that took a moment to start bleeding. I will never risk my poor feet again, and now it's hard for me to use my actual cheese grater without getting grossed out thinking about my bleeding feet! :0