Alden 8501P Grabit Damaged Screw Remover #1 Two-step drill bit and extractor in one tool. Multiple tools not required. Serrated extracting end of tool bites into damaged screw head. Easily remove most stubborn hard to remove screws. Can be used in quick change chucks. Easy to use. Tempered twice for extra hardness. Results in multiple extractions per tool. Made from hardened tool steel. Re-usable for long life.