Tweezerman Comfort Callus Shaver & Rasp The comfort callus shaver & rasp is a multi purpose pedicure tool that shaves calluses & smoothes skin. For best results: Clean & soak feet to prep & help soften hard skin. Repeatedly glide shaver gently across the corn or callus to remove thin layers of hard, dead skin. After removing calluses, snap rasp onto head of shaver & work back & forth over callused area to smooth skin