Alden Drill-Out extractors are the only power extractors in the world. The patented design drills and extracts broken screws and bolts in one step. Each tool is specially designed to drill into rough surfaces that are caused when bolts break. The tip allows you to obtain a perfectly centered hole without the tip walking or wandering. Its left-handed cutting edge (set drill to reverse) helps to loosen the bolt before the extractor engages. It will not bind or break inside "frozen" bolts, as most other extractors tend to do. Removes: #5, #6, #8, #10, #12, 1/4", M3, M4, M5, and M6 screws and bolts. 1 lbs (0.5Kg) shipping weight.